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   1  /*  Prototype JavaScript framework, version 1.6.0.2
   2   *  (c) 2005-2008 Sam Stephenson
   3   *
   4   *  Prototype is freely distributable under the terms of an MIT-style license.
   5   *  For details, see the Prototype web site: http://www.prototypejs.org/
   6   *
   7   *--------------------------------------------------------------------------*/
   8  
   9  var Prototype = {
  10    Version: '1.6.0.2',
  11  
  12    Browser: {
  13      IE:     !!(window.attachEvent && !window.opera),
  14      Opera:  !!window.opera,
  15      WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
  16      Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
  17      MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  18    },
  19  
  20    BrowserFeatures: {
  21      XPath: !!document.evaluate,
  22      ElementExtensions: !!window.HTMLElement,
  23      SpecificElementExtensions:
  24        document.createElement('div').__proto__ &&
  25        document.createElement('div').__proto__ !==
  26          document.createElement('form').__proto__
  27    },
  28  
  29    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  30    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
  31  
  32    emptyFunction: function() { },
  33    K: function(x) { return x }
  34  };
  35  
  36  if (Prototype.Browser.MobileSafari)
  37    Prototype.BrowserFeatures.SpecificElementExtensions = false;
  38  
  39  
  40  /* Based on Alex Arnell's inheritance implementation. */
  41  var Class = {
  42    create: function() {
  43      var parent = null, properties = $A(arguments);
  44      if (Object.isFunction(properties[0]))
  45        parent = properties.shift();
  46  
  47      function klass() {
  48        this.initialize.apply(this, arguments);
  49      }
  50  
  51      Object.extend(klass, Class.Methods);
  52      klass.superclass = parent;
  53      klass.subclasses = [];
  54  
  55      if (parent) {
  56        var subclass = function() { };
  57        subclass.prototype = parent.prototype;
  58        klass.prototype = new subclass;
  59        parent.subclasses.push(klass);
  60      }
  61  
  62      for (var i = 0; i < properties.length; i++)
  63        klass.addMethods(properties[i]);
  64  
  65      if (!klass.prototype.initialize)
  66        klass.prototype.initialize = Prototype.emptyFunction;
  67  
  68      klass.prototype.constructor = klass;
  69  
  70      return klass;
  71    }
  72  };
  73  
  74  Class.Methods = {
  75    addMethods: function(source) {
  76      var ancestor   = this.superclass && this.superclass.prototype;
  77      var properties = Object.keys(source);
  78  
  79      if (!Object.keys({ toString: true }).length)
  80        properties.push("toString", "valueOf");
  81  
  82      for (var i = 0, length = properties.length; i < length; i++) {
  83        var property = properties[i], value = source[property];
  84        if (ancestor && Object.isFunction(value) &&
  85            value.argumentNames().first() == "$super") {
  86          var method = value, value = Object.extend((function(m) {
  87            return function() { return ancestor[m].apply(this, arguments) };
  88          })(property).wrap(method), {
  89            valueOf:  function() { return method },
  90            toString: function() { return method.toString() }
  91          });
  92        }
  93        this.prototype[property] = value;
  94      }
  95  
  96      return this;
  97    }
  98  };
  99  
 100  var Abstract = { };
 101  
 102  Object.extend = function(destination, source) {
 103    for (var property in source)
 104      destination[property] = source[property];
 105    return destination;
 106  };
 107  
 108  Object.extend(Object, {
 109    inspect: function(object) {
 110      try {
 111        if (Object.isUndefined(object)) return 'undefined';
 112        if (object === null) return 'null';
 113        return object.inspect ? object.inspect() : String(object);
 114      } catch (e) {
 115        if (e instanceof RangeError) return '...';
 116        throw e;
 117      }
 118    },
 119  
 120    toJSON: function(object) {
 121      var type = typeof object;
 122      switch (type) {
 123        case 'undefined':
 124        case 'function':
 125        case 'unknown': return;
 126        case 'boolean': return object.toString();
 127      }
 128  
 129      if (object === null) return 'null';
 130      if (object.toJSON) return object.toJSON();
 131      if (Object.isElement(object)) return;
 132  
 133      var results = [];
 134      for (var property in object) {
 135        var value = Object.toJSON(object[property]);
 136        if (!Object.isUndefined(value))
 137          results.push(property.toJSON() + ': ' + value);
 138      }
 139  
 140      return '{' + results.join(', ') + '}';
 141    },
 142  
 143    toQueryString: function(object) {
 144      return $H(object).toQueryString();
 145    },
 146  
 147    toHTML: function(object) {
 148      return object && object.toHTML ? object.toHTML() : String.interpret(object);
 149    },
 150  
 151    keys: function(object) {
 152      var keys = [];
 153      for (var property in object)
 154        keys.push(property);
 155      return keys;
 156    },
 157  
 158    values: function(object) {
 159      var values = [];
 160      for (var property in object)
 161        values.push(object[property]);
 162      return values;
 163    },
 164  
 165    clone: function(object) {
 166      return Object.extend({ }, object);
 167    },
 168  
 169    isElement: function(object) {
 170      return object && object.nodeType == 1;
 171    },
 172  
 173    isArray: function(object) {
 174      return object != null && typeof object == "object" &&
 175        'splice' in object && 'join' in object;
 176    },
 177  
 178    isHash: function(object) {
 179      return object instanceof Hash;
 180    },
 181  
 182    isFunction: function(object) {
 183      return typeof object == "function";
 184    },
 185  
 186    isString: function(object) {
 187      return typeof object == "string";
 188    },
 189  
 190    isNumber: function(object) {
 191      return typeof object == "number";
 192    },
 193  
 194    isUndefined: function(object) {
 195      return typeof object == "undefined";
 196    }
 197  });
 198  
 199  Object.extend(Function.prototype, {
 200    argumentNames: function() {
 201      var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
 202      return names.length == 1 && !names[0] ? [] : names;
 203    },
 204  
 205    bind: function() {
 206      if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
 207      var __method = this, args = $A(arguments), object = args.shift();
 208      return function() {
 209        return __method.apply(object, args.concat($A(arguments)));
 210      }
 211    },
 212  
 213    bindAsEventListener: function() {
 214      var __method = this, args = $A(arguments), object = args.shift();
 215      return function(event) {
 216        return __method.apply(object, [event || window.event].concat(args));
 217      }
 218    },
 219  
 220    curry: function() {
 221      if (!arguments.length) return this;
 222      var __method = this, args = $A(arguments);
 223      return function() {
 224        return __method.apply(this, args.concat($A(arguments)));
 225      }
 226    },
 227  
 228    delay: function() {
 229      var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
 230      return window.setTimeout(function() {
 231        return __method.apply(__method, args);
 232      }, timeout);
 233    },
 234  
 235    wrap: function(wrapper) {
 236      var __method = this;
 237      return function() {
 238        return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
 239      }
 240    },
 241  
 242    methodize: function() {
 243      if (this._methodized) return this._methodized;
 244      var __method = this;
 245      return this._methodized = function() {
 246        return __method.apply(null, [this].concat($A(arguments)));
 247      };
 248    }
 249  });
 250  
 251  Function.prototype.defer = Function.prototype.delay.curry(0.01);
 252  
 253  Date.prototype.toJSON = function() {
 254    return '"' + this.getUTCFullYear() + '-' +
 255      (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
 256      this.getUTCDate().toPaddedString(2) + 'T' +
 257      this.getUTCHours().toPaddedString(2) + ':' +
 258      this.getUTCMinutes().toPaddedString(2) + ':' +
 259      this.getUTCSeconds().toPaddedString(2) + 'Z"';
 260  };
 261  
 262  var Try = {
 263    these: function() {
 264      var returnValue;
 265  
 266      for (var i = 0, length = arguments.length; i < length; i++) {
 267        var lambda = arguments[i];
 268        try {
 269          returnValue = lambda();
 270          break;
 271        } catch (e) { }
 272      }
 273  
 274      return returnValue;
 275    }
 276  };
 277  
 278  RegExp.prototype.match = RegExp.prototype.test;
 279  
 280  RegExp.escape = function(str) {
 281    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
 282  };
 283  
 284  /*--------------------------------------------------------------------------*/
 285  
 286  var PeriodicalExecuter = Class.create({
 287    initialize: function(callback, frequency) {
 288      this.callback = callback;
 289      this.frequency = frequency;
 290      this.currentlyExecuting = false;
 291  
 292      this.registerCallback();
 293    },
 294  
 295    registerCallback: function() {
 296      this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 297    },
 298  
 299    execute: function() {
 300      this.callback(this);
 301    },
 302  
 303    stop: function() {
 304      if (!this.timer) return;
 305      clearInterval(this.timer);
 306      this.timer = null;
 307    },
 308  
 309    onTimerEvent: function() {
 310      if (!this.currentlyExecuting) {
 311        try {
 312          this.currentlyExecuting = true;
 313          this.execute();
 314        } finally {
 315          this.currentlyExecuting = false;
 316        }
 317      }
 318    }
 319  });
 320  Object.extend(String, {
 321    interpret: function(value) {
 322      return value == null ? '' : String(value);
 323    },
 324    specialChar: {
 325      '\b': '\\b',
 326      '\t': '\\t',
 327      '\n': '\\n',
 328      '\f': '\\f',
 329      '\r': '\\r',
 330      '\\': '\\\\'
 331    }
 332  });
 333  
 334  Object.extend(String.prototype, {
 335    gsub: function(pattern, replacement) {
 336      var result = '', source = this, match;
 337      replacement = arguments.callee.prepareReplacement(replacement);
 338  
 339      while (source.length > 0) {
 340        if (match = source.match(pattern)) {
 341          result += source.slice(0, match.index);
 342          result += String.interpret(replacement(match));
 343          source  = source.slice(match.index + match[0].length);
 344        } else {
 345          result += source, source = '';
 346        }
 347      }
 348      return result;
 349    },
 350  
 351    sub: function(pattern, replacement, count) {
 352      replacement = this.gsub.prepareReplacement(replacement);
 353      count = Object.isUndefined(count) ? 1 : count;
 354  
 355      return this.gsub(pattern, function(match) {
 356        if (--count < 0) return match[0];
 357        return replacement(match);
 358      });
 359    },
 360  
 361    scan: function(pattern, iterator) {
 362      this.gsub(pattern, iterator);
 363      return String(this);
 364    },
 365  
 366    truncate: function(length, truncation) {
 367      length = length || 30;
 368      truncation = Object.isUndefined(truncation) ? '...' : truncation;
 369      return this.length > length ?
 370        this.slice(0, length - truncation.length) + truncation : String(this);
 371    },
 372  
 373    strip: function() {
 374      return this.replace(/^\s+/, '').replace(/\s+$/, '');
 375    },
 376  
 377    stripTags: function() {
 378      return this.replace(/<\/?[^>]+>/gi, '');
 379    },
 380  
 381    stripScripts: function() {
 382      return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
 383    },
 384  
 385    extractScripts: function() {
 386      var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
 387      var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
 388      return (this.match(matchAll) || []).map(function(scriptTag) {
 389        return (scriptTag.match(matchOne) || ['', ''])[1];
 390      });
 391    },
 392  
 393    evalScripts: function() {
 394      return this.extractScripts().map(function(script) { return eval(script) });
 395    },
 396  
 397    escapeHTML: function() {
 398      var self = arguments.callee;
 399      self.text.data = this;
 400      return self.div.innerHTML;
 401    },
 402  
 403    unescapeHTML: function() {
 404      var div = new Element('div');
 405      div.innerHTML = this.stripTags();
 406      return div.childNodes[0] ? (div.childNodes.length > 1 ?
 407        $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
 408        div.childNodes[0].nodeValue) : '';
 409    },
 410  
 411    toQueryParams: function(separator) {
 412      var match = this.strip().match(/([^?#]*)(#.*)?$/);
 413      if (!match) return { };
 414  
 415      return match[1].split(separator || '&').inject({ }, function(hash, pair) {
 416        if ((pair = pair.split('='))[0]) {
 417          var key = decodeURIComponent(pair.shift());
 418          var value = pair.length > 1 ? pair.join('=') : pair[0];
 419          if (value != undefined) value = decodeURIComponent(value);
 420  
 421          if (key in hash) {
 422            if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
 423            hash[key].push(value);
 424          }
 425          else hash[key] = value;
 426        }
 427        return hash;
 428      });
 429    },
 430  
 431    toArray: function() {
 432      return this.split('');
 433    },
 434  
 435    succ: function() {
 436      return this.slice(0, this.length - 1) +
 437        String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
 438    },
 439  
 440    times: function(count) {
 441      return count < 1 ? '' : new Array(count + 1).join(this);
 442    },
 443  
 444    camelize: function() {
 445      var parts = this.split('-'), len = parts.length;
 446      if (len == 1) return parts[0];
 447  
 448      var camelized = this.charAt(0) == '-'
 449        ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
 450        : parts[0];
 451  
 452      for (var i = 1; i < len; i++)
 453        camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
 454  
 455      return camelized;
 456    },
 457  
 458    capitalize: function() {
 459      return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
 460    },
 461  
 462    underscore: function() {
 463      return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
 464    },
 465  
 466    dasherize: function() {
 467      return this.gsub(/_/,'-');
 468    },
 469  
 470    inspect: function(useDoubleQuotes) {
 471      var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
 472        var character = String.specialChar[match[0]];
 473        return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
 474      });
 475      if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
 476      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
 477    },
 478  
 479    toJSON: function() {
 480      return this.inspect(true);
 481    },
 482  
 483    unfilterJSON: function(filter) {
 484      return this.sub(filter || Prototype.JSONFilter, '#{1}');
 485    },
 486  
 487    isJSON: function() {
 488      var str = this;
 489      if (str.blank()) return false;
 490      str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
 491      return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
 492    },
 493  
 494    evalJSON: function(sanitize) {
 495      var json = this.unfilterJSON();
 496      try {
 497        if (!sanitize || json.isJSON()) return eval('(' + json + ')');
 498      } catch (e) { }
 499      throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
 500    },
 501  
 502    include: function(pattern) {
 503      return this.indexOf(pattern) > -1;
 504    },
 505  
 506    startsWith: function(pattern) {
 507      return this.indexOf(pattern) === 0;
 508    },
 509  
 510    endsWith: function(pattern) {
 511      var d = this.length - pattern.length;
 512      return d >= 0 && this.lastIndexOf(pattern) === d;
 513    },
 514  
 515    empty: function() {
 516      return this == '';
 517    },
 518  
 519    blank: function() {
 520      return /^\s*$/.test(this);
 521    },
 522  
 523    interpolate: function(object, pattern) {
 524      return new Template(this, pattern).evaluate(object);
 525    }
 526  });
 527  
 528  if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
 529    escapeHTML: function() {
 530      return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 531    },
 532    unescapeHTML: function() {
 533      return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
 534    }
 535  });
 536  
 537  String.prototype.gsub.prepareReplacement = function(replacement) {
 538    if (Object.isFunction(replacement)) return replacement;
 539    var template = new Template(replacement);
 540    return function(match) { return template.evaluate(match) };
 541  };
 542  
 543  String.prototype.parseQuery = String.prototype.toQueryParams;
 544  
 545  Object.extend(String.prototype.escapeHTML, {
 546    div:  document.createElement('div'),
 547    text: document.createTextNode('')
 548  });
 549  
 550  with (String.prototype.escapeHTML) div.appendChild(text);
 551  
 552  var Template = Class.create({
 553    initialize: function(template, pattern) {
 554      this.template = template.toString();
 555      this.pattern = pattern || Template.Pattern;
 556    },
 557  
 558    evaluate: function(object) {
 559      if (Object.isFunction(object.toTemplateReplacements))
 560        object = object.toTemplateReplacements();
 561  
 562      return this.template.gsub(this.pattern, function(match) {
 563        if (object == null) return '';
 564  
 565        var before = match[1] || '';
 566        if (before == '\\') return match[2];
 567  
 568        var ctx = object, expr = match[3];
 569        var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
 570        match = pattern.exec(expr);
 571        if (match == null) return before;
 572  
 573        while (match != null) {
 574          var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
 575          ctx = ctx[comp];
 576          if (null == ctx || '' == match[3]) break;
 577          expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
 578          match = pattern.exec(expr);
 579        }
 580  
 581        return before + String.interpret(ctx);
 582      });
 583    }
 584  });
 585  Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 586  
 587  var $break = { };
 588  
 589  var Enumerable = {
 590    each: function(iterator, context) {
 591      var index = 0;
 592      iterator = iterator.bind(context);
 593      try {
 594        this._each(function(value) {
 595          iterator(value, index++);
 596        });
 597      } catch (e) {
 598        if (e != $break) throw e;
 599      }
 600      return this;
 601    },
 602  
 603    eachSlice: function(number, iterator, context) {
 604      iterator = iterator ? iterator.bind(context) : Prototype.K;
 605      var index = -number, slices = [], array = this.toArray();
 606      while ((index += number) < array.length)
 607        slices.push(array.slice(index, index+number));
 608      return slices.collect(iterator, context);
 609    },
 610  
 611    all: function(iterator, context) {
 612      iterator = iterator ? iterator.bind(context) : Prototype.K;
 613      var result = true;
 614      this.each(function(value, index) {
 615        result = result && !!iterator(value, index);
 616        if (!result) throw $break;
 617      });
 618      return result;
 619    },
 620  
 621    any: function(iterator, context) {
 622      iterator = iterator ? iterator.bind(context) : Prototype.K;
 623      var result = false;
 624      this.each(function(value, index) {
 625        if (result = !!iterator(value, index))
 626          throw $break;
 627      });
 628      return result;
 629    },
 630  
 631    collect: function(iterator, context) {
 632      iterator = iterator ? iterator.bind(context) : Prototype.K;
 633      var results = [];
 634      this.each(function(value, index) {
 635        results.push(iterator(value, index));
 636      });
 637      return results;
 638    },
 639  
 640    detect: function(iterator, context) {
 641      iterator = iterator.bind(context);
 642      var result;
 643      this.each(function(value, index) {
 644        if (iterator(value, index)) {
 645          result = value;
 646          throw $break;
 647        }
 648      });
 649      return result;
 650    },
 651  
 652    findAll: function(iterator, context) {
 653      iterator = iterator.bind(context);
 654      var results = [];
 655      this.each(function(value, index) {
 656        if (iterator(value, index))
 657          results.push(value);
 658      });
 659      return results;
 660    },
 661  
 662    grep: function(filter, iterator, context) {
 663      iterator = iterator ? iterator.bind(context) : Prototype.K;
 664      var results = [];
 665  
 666      if (Object.isString(filter))
 667        filter = new RegExp(filter);
 668  
 669      this.each(function(value, index) {
 670        if (filter.match(value))
 671          results.push(iterator(value, index));
 672      });
 673      return results;
 674    },
 675  
 676    include: function(object) {
 677      if (Object.isFunction(this.indexOf))
 678        if (this.indexOf(object) != -1) return true;
 679  
 680      var found = false;
 681      this.each(function(value) {
 682        if (value == object) {
 683          found = true;
 684          throw $break;
 685        }
 686      });
 687      return found;
 688    },
 689  
 690    inGroupsOf: function(number, fillWith) {
 691      fillWith = Object.isUndefined(fillWith) ? null : fillWith;
 692      return this.eachSlice(number, function(slice) {
 693        while(slice.length < number) slice.push(fillWith);
 694        return slice;
 695      });
 696    },
 697  
 698    inject: function(memo, iterator, context) {
 699      iterator = iterator.bind(context);
 700      this.each(function(value, index) {
 701        memo = iterator(memo, value, index);
 702      });
 703      return memo;
 704    },
 705  
 706    invoke: function(method) {
 707      var args = $A(arguments).slice(1);
 708      return this.map(function(value) {
 709        return value[method].apply(value, args);
 710      });
 711    },
 712  
 713    max: function(iterator, context) {
 714      iterator = iterator ? iterator.bind(context) : Prototype.K;
 715      var result;
 716      this.each(function(value, index) {
 717        value = iterator(value, index);
 718        if (result == null || value >= result)
 719          result = value;
 720      });
 721      return result;
 722    },
 723  
 724    min: function(iterator, context) {
 725      iterator = iterator ? iterator.bind(context) : Prototype.K;
 726      var result;
 727      this.each(function(value, index) {
 728        value = iterator(value, index);
 729        if (result == null || value < result)
 730          result = value;
 731      });
 732      return result;
 733    },
 734  
 735    partition: function(iterator, context) {
 736      iterator = iterator ? iterator.bind(context) : Prototype.K;
 737      var trues = [], falses = [];
 738      this.each(function(value, index) {
 739        (iterator(value, index) ?
 740          trues : falses).push(value);
 741      });
 742      return [trues, falses];
 743    },
 744  
 745    pluck: function(property) {
 746      var results = [];
 747      this.each(function(value) {
 748        results.push(value[property]);
 749      });
 750      return results;
 751    },
 752  
 753    reject: function(iterator, context) {
 754      iterator = iterator.bind(context);
 755      var results = [];
 756      this.each(function(value, index) {
 757        if (!iterator(value, index))
 758          results.push(value);
 759      });
 760      return results;
 761    },
 762  
 763    sortBy: function(iterator, context) {
 764      iterator = iterator.bind(context);
 765      return this.map(function(value, index) {
 766        return {value: value, criteria: iterator(value, index)};
 767      }).sort(function(left, right) {
 768        var a = left.criteria, b = right.criteria;
 769        return a < b ? -1 : a > b ? 1 : 0;
 770      }).pluck('value');
 771    },
 772  
 773    toArray: function() {
 774      return this.map();
 775    },
 776  
 777    zip: function() {
 778      var iterator = Prototype.K, args = $A(arguments);
 779      if (Object.isFunction(args.last()))
 780        iterator = args.pop();
 781  
 782      var collections = [this].concat(args).map($A);
 783      return this.map(function(value, index) {
 784        return iterator(collections.pluck(index));
 785      });
 786    },
 787  
 788    size: function() {
 789      return this.toArray().length;
 790    },
 791  
 792    inspect: function() {
 793      return '#<Enumerable:' + this.toArray().inspect() + '>';
 794    }
 795  };
 796  
 797  Object.extend(Enumerable, {
 798    map:     Enumerable.collect,
 799    find:    Enumerable.detect,
 800    select:  Enumerable.findAll,
 801    filter:  Enumerable.findAll,
 802    member:  Enumerable.include,
 803    entries: Enumerable.toArray,
 804    every:   Enumerable.all,
 805    some:    Enumerable.any
 806  });
 807  function $A(iterable) {
 808    if (!iterable) return [];
 809    if (iterable.toArray) return iterable.toArray();
 810    var length = iterable.length || 0, results = new Array(length);
 811    while (length--) results[length] = iterable[length];
 812    return results;
 813  }
 814  
 815  if (Prototype.Browser.WebKit) {
 816    $A = function(iterable) {
 817      if (!iterable) return [];
 818      if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
 819          iterable.toArray) return iterable.toArray();
 820      var length = iterable.length || 0, results = new Array(length);
 821      while (length--) results[length] = iterable[length];
 822      return results;
 823    };
 824  }
 825  
 826  Array.from = $A;
 827  
 828  Object.extend(Array.prototype, Enumerable);
 829  
 830  if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
 831  
 832  Object.extend(Array.prototype, {
 833    _each: function(iterator) {
 834      for (var i = 0, length = this.length; i < length; i++)
 835        iterator(this[i]);
 836    },
 837  
 838    clear: function() {
 839      this.length = 0;
 840      return this;
 841    },
 842  
 843    first: function() {
 844      return this[0];
 845    },
 846  
 847    last: function() {
 848      return this[this.length - 1];
 849    },
 850  
 851    compact: function() {
 852      return this.select(function(value) {
 853        return value != null;
 854      });
 855    },
 856  
 857    flatten: function() {
 858      return this.inject([], function(array, value) {
 859        return array.concat(Object.isArray(value) ?
 860          value.flatten() : [value]);
 861      });
 862    },
 863  
 864    without: function() {
 865      var values = $A(arguments);
 866      return this.select(function(value) {
 867        return !values.include(value);
 868      });
 869    },
 870  
 871    reverse: function(inline) {
 872      return (inline !== false ? this : this.toArray())._reverse();
 873    },
 874  
 875    reduce: function() {
 876      return this.length > 1 ? this : this[0];
 877    },
 878  
 879    uniq: function(sorted) {
 880      return this.inject([], function(array, value, index) {
 881        if (0 == index || (sorted ? array.last() != value : !array.include(value)))
 882          array.push(value);
 883        return array;
 884      });
 885    },
 886  
 887    intersect: function(array) {
 888      return this.uniq().findAll(function(item) {
 889        return array.detect(function(value) { return item === value });
 890      });
 891    },
 892  
 893    clone: function() {
 894      return [].concat(this);
 895    },
 896  
 897    size: function() {
 898      return this.length;
 899    },
 900  
 901    inspect: function() {
 902      return '[' + this.map(Object.inspect).join(', ') + ']';
 903    },
 904  
 905    toJSON: function() {
 906      var results = [];
 907      this.each(function(object) {
 908        var value = Object.toJSON(object);
 909        if (!Object.isUndefined(value)) results.push(value);
 910      });
 911      return '[' + results.join(', ') + ']';
 912    }
 913  });
 914  
 915  // use native browser JS 1.6 implementation if available
 916  if (Object.isFunction(Array.prototype.forEach))
 917    Array.prototype._each = Array.prototype.forEach;
 918  
 919  if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
 920    i || (i = 0);
 921    var length = this.length;
 922    if (i < 0) i = length + i;
 923    for (; i < length; i++)
 924      if (this[i] === item) return i;
 925    return -1;
 926  };
 927  
 928  if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
 929    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
 930    var n = this.slice(0, i).reverse().indexOf(item);
 931    return (n < 0) ? n : i - n - 1;
 932  };
 933  
 934  Array.prototype.toArray = Array.prototype.clone;
 935  
 936  function $w(string) {
 937    if (!Object.isString(string)) return [];
 938    string = string.strip();
 939    return string ? string.split(/\s+/) : [];
 940  }
 941  
 942  if (Prototype.Browser.Opera){
 943    Array.prototype.concat = function() {
 944      var array = [];
 945      for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
 946      for (var i = 0, length = arguments.length; i < length; i++) {
 947        if (Object.isArray(arguments[i])) {
 948          for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
 949            array.push(arguments[i][j]);
 950        } else {
 951          array.push(arguments[i]);
 952        }
 953      }
 954      return array;
 955    };
 956  }
 957  Object.extend(Number.prototype, {
 958    toColorPart: function() {
 959      return this.toPaddedString(2, 16);
 960    },
 961  
 962    succ: function() {
 963      return this + 1;
 964    },
 965  
 966    times: function(iterator) {
 967      $R(0, this, true).each(iterator);
 968      return this;
 969    },
 970  
 971    toPaddedString: function(length, radix) {
 972      var string = this.toString(radix || 10);
 973      return '0'.times(length - string.length) + string;
 974    },
 975  
 976    toJSON: function() {
 977      return isFinite(this) ? this.toString() : 'null';
 978    }
 979  });
 980  
 981  $w('abs round ceil floor').each(function(method){
 982    Number.prototype[method] = Math[method].methodize();
 983  });
 984  function $H(object) {
 985    return new Hash(object);
 986  };
 987  
 988  var Hash = Class.create(Enumerable, (function() {
 989  
 990    function toQueryPair(key, value) {
 991      if (Object.isUndefined(value)) return key;
 992      return key + '=' + encodeURIComponent(String.interpret(value));
 993    }
 994  
 995    return {
 996      initialize: function(object) {
 997        this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
 998      },
 999  
1000      _each: function(iterator) {
1001        for (var key in this._object) {
1002          var value = this._object[key], pair = [key, value];
1003          pair.key = key;
1004          pair.value = value;
1005          iterator(pair);
1006        }
1007      },
1008  
1009      set: function(key, value) {
1010        return this._object[key] = value;
1011      },
1012  
1013      get: function(key) {
1014        return this._object[key];
1015      },
1016  
1017      unset: function(key) {
1018        var value = this._object[key];
1019        delete this._object[key];
1020        return value;
1021      },
1022  
1023      toObject: function() {
1024        return Object.clone(this._object);
1025      },
1026  
1027      keys: function() {
1028        return this.pluck('key');
1029      },
1030  
1031      values: function() {
1032        return this.pluck('value');
1033      },
1034  
1035      index: function(value) {
1036        var match = this.detect(function(pair) {
1037          return pair.value === value;
1038        });
1039        return match && match.key;
1040      },
1041  
1042      merge: function(object) {
1043        return this.clone().update(object);
1044      },
1045  
1046      update: function(object) {
1047        return new Hash(object).inject(this, function(result, pair) {
1048          result.set(pair.key, pair.value);
1049          return result;
1050        });
1051      },
1052  
1053      toQueryString: function() {
1054        return this.map(function(pair) {
1055          var key = encodeURIComponent(pair.key), values = pair.value;
1056  
1057          if (values && typeof values == 'object') {
1058            if (Object.isArray(values))
1059              return values.map(toQueryPair.curry(key)).join('&');
1060          }
1061          return toQueryPair(key, values);
1062        }).join('&');
1063      },
1064  
1065      inspect: function() {
1066        return '#<Hash:{' + this.map(function(pair) {
1067          return pair.map(Object.inspect).join(': ');
1068        }).join(', ') + '}>';
1069      },
1070  
1071      toJSON: function() {
1072        return Object.toJSON(this.toObject());
1073      },
1074  
1075      clone: function() {
1076        return new Hash(this);
1077      }
1078    }
1079  })());
1080  
1081  Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
1082  Hash.from = $H;
1083  var ObjectRange = Class.create(Enumerable, {
1084    initialize: function(start, end, exclusive) {
1085      this.start = start;
1086      this.end = end;
1087      this.exclusive = exclusive;
1088    },
1089  
1090    _each: function(iterator) {
1091      var value = this.start;
1092      while (this.include(value)) {
1093        iterator(value);
1094        value = value.succ();
1095      }
1096    },
1097  
1098    include: function(value) {
1099      if (value < this.start)
1100        return false;
1101      if (this.exclusive)
1102        return value < this.end;
1103      return value <= this.end;
1104    }
1105  });
1106  
1107  var $R = function(start, end, exclusive) {
1108    return new ObjectRange(start, end, exclusive);
1109  };
1110  
1111  var Ajax = {
1112    getTransport: function() {
1113      return Try.these(
1114        function() {return new XMLHttpRequest()},
1115        function() {return new ActiveXObject('Msxml2.XMLHTTP')},
1116        function() {return new ActiveXObject('Microsoft.XMLHTTP')}
1117      ) || false;
1118    },
1119  
1120    activeRequestCount: 0
1121  };
1122  
1123  Ajax.Responders = {
1124    responders: [],
1125  
1126    _each: function(iterator) {
1127      this.responders._each(iterator);
1128    },
1129  
1130    register: function(responder) {
1131      if (!this.include(responder))
1132        this.responders.push(responder);
1133    },
1134  
1135    unregister: function(responder) {
1136      this.responders = this.responders.without(responder);
1137    },
1138  
1139    dispatch: function(callback, request, transport, json) {
1140      this.each(function(responder) {
1141        if (Object.isFunction(responder[callback])) {
1142          try {
1143            responder[callback].apply(responder, [request, transport, json]);
1144          } catch (e) { }
1145        }
1146      });
1147    }
1148  };
1149  
1150  Object.extend(Ajax.Responders, Enumerable);
1151  
1152  Ajax.Responders.register({
1153    onCreate:   function() { Ajax.activeRequestCount++ },
1154    onComplete: function() { Ajax.activeRequestCount-- }
1155  });
1156  
1157  Ajax.Base = Class.create({
1158    initialize: function(options) {
1159      this.options = {
1160        method:       'post',
1161        asynchronous: true,
1162        contentType:  'application/x-www-form-urlencoded',
1163        encoding:     'UTF-8',
1164        parameters:   '',
1165        evalJSON:     true,
1166        evalJS:       true
1167      };
1168      Object.extend(this.options, options || { });
1169  
1170      this.options.method = this.options.method.toLowerCase();
1171  
1172      if (Object.isString(this.options.parameters))
1173        this.options.parameters = this.options.parameters.toQueryParams();
1174      else if (Object.isHash(this.options.parameters))
1175        this.options.parameters = this.options.parameters.toObject();
1176    }
1177  });
1178  
1179  Ajax.Request = Class.create(Ajax.Base, {
1180    _complete: false,
1181  
1182    initialize: function($super, url, options) {
1183      $super(options);
1184      this.transport = Ajax.getTransport();
1185      this.request(url);
1186    },
1187  
1188    request: function(url) {
1189      this.url = url;
1190      this.method = this.options.method;
1191      var params = Object.clone(this.options.parameters);
1192  
1193      if (!['get', 'post'].include(this.method)) {
1194        // simulate other verbs over post
1195        params['_method'] = this.method;
1196        this.method = 'post';
1197      }
1198  
1199      this.parameters = params;
1200  
1201      if (params = Object.toQueryString(params)) {
1202        // when GET, append parameters to URL
1203        if (this.method == 'get')
1204          this.url += (this.url.include('?') ? '&' : '?') + params;
1205        else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
1206          params += '&_=';
1207      }
1208  
1209      try {
1210        var response = new Ajax.Response(this);
1211        if (this.options.onCreate) this.options.onCreate(response);
1212        Ajax.Responders.dispatch('onCreate', this, response);
1213  
1214        this.transport.open(this.method.toUpperCase(), this.url,
1215          this.options.asynchronous);
1216  
1217        if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
1218  
1219        this.transport.onreadystatechange = this.onStateChange.bind(this);
1220        this.setRequestHeaders();
1221  
1222        this.body = this.method == 'post' ? (this.options.postBody || params) : null;
1223        this.transport.send(this.body);
1224  
1225        /* Force Firefox to handle ready state 4 for synchronous requests */
1226        if (!this.options.asynchronous && this.transport.overrideMimeType)
1227          this.onStateChange();
1228  
1229      }
1230      catch (e) {
1231        this.dispatchException(e);
1232      }
1233    },
1234  
1235    onStateChange: function() {
1236      var readyState = this.transport.readyState;
1237      if (readyState > 1 && !((readyState == 4) && this._complete))
1238        this.respondToReadyState(this.transport.readyState);
1239    },
1240  
1241    setRequestHeaders: function() {
1242      var headers = {
1243        'X-Requested-With': 'XMLHttpRequest',
1244        'X-Prototype-Version': Prototype.Version,
1245        'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
1246      };
1247  
1248      if (this.method == 'post') {
1249        headers['Content-type'] = this.options.contentType +
1250          (this.options.encoding ? '; charset=' + this.options.encoding : '');
1251  
1252        /* Force "Connection: close" for older Mozilla browsers to work
1253         * around a bug where XMLHttpRequest sends an incorrect
1254         * Content-length header. See Mozilla Bugzilla #246651.
1255         */
1256        if (this.transport.overrideMimeType &&
1257            (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
1258              headers['Connection'] = 'close';
1259      }
1260  
1261      // user-defined headers
1262      if (typeof this.options.requestHeaders == 'object') {
1263        var extras = this.options.requestHeaders;
1264  
1265        if (Object.isFunction(extras.push))
1266          for (var i = 0, length = extras.length; i < length; i += 2)
1267            headers[extras[i]] = extras[i+1];
1268        else
1269          $H(extras).each(function(pair) { headers[pair.key] = pair.value });
1270      }
1271  
1272      for (var name in headers)
1273        this.transport.setRequestHeader(name, headers[name]);
1274    },
1275  
1276    success: function() {
1277      var status = this.getStatus();
1278      return !status || (status >= 200 && status < 300);
1279    },
1280  
1281    getStatus: function() {
1282      try {
1283        return this.transport.status || 0;
1284      } catch (e) { return 0 }
1285    },
1286  
1287    respondToReadyState: function(readyState) {
1288      var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
1289  
1290      if (state == 'Complete') {
1291        try {
1292          this._complete = true;
1293          (this.options['on' + response.status]
1294           || this.options['on' + (this.success() ? 'Success' : 'Failure')]
1295           || Prototype.emptyFunction)(response, response.headerJSON);
1296        } catch (e) {
1297          this.dispatchException(e);
1298        }
1299  
1300        var contentType = response.getHeader('Content-type');
1301        if (this.options.evalJS == 'force'
1302            || (this.options.evalJS && this.isSameOrigin() && contentType
1303            && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
1304          this.evalResponse();
1305      }
1306  
1307      try {
1308        (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
1309        Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
1310      } catch (e) {
1311        this.dispatchException(e);
1312      }
1313  
1314      if (state == 'Complete') {
1315        // avoid memory leak in MSIE: clean up
1316        this.transport.onreadystatechange = Prototype.emptyFunction;
1317      }
1318    },
1319  
1320    isSameOrigin: function() {
1321      var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
1322      return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
1323        protocol: location.protocol,
1324        domain: document.domain,
1325        port: location.port ? ':' + location.port : ''
1326      }));
1327    },
1328  
1329    getHeader: function(name) {
1330      try {
1331        return this.transport.getResponseHeader(name) || null;
1332      } catch (e) { return null }
1333    },
1334  
1335    evalResponse: function() {
1336      try {
1337        return eval((this.transport.responseText || '').unfilterJSON());
1338      } catch (e) {
1339        this.dispatchException(e);
1340      }
1341    },
1342  
1343    dispatchException: function(exception) {
1344      (this.options.onException || Prototype.emptyFunction)(this, exception);
1345      Ajax.Responders.dispatch('onException', this, exception);
1346    }
1347  });
1348  
1349  Ajax.Request.Events =
1350    ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
1351  
1352  Ajax.Response = Class.create({
1353    initialize: function(request){
1354      this.request = request;
1355      var transport  = this.transport  = request.transport,
1356          readyState = this.readyState = transport.readyState;
1357  
1358      if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
1359        this.status       = this.getStatus();
1360        this.statusText   = this.getStatusText();
1361        this.responseText = String.interpret(transport.responseText);
1362        this.headerJSON   = this._getHeaderJSON();
1363      }
1364  
1365      if(readyState == 4) {
1366        var xml = transport.responseXML;
1367        this.responseXML  = Object.isUndefined(xml) ? null : xml;
1368        this.responseJSON = this._getResponseJSON();
1369      }
1370    },
1371  
1372    status:      0,
1373    statusText: '',
1374  
1375    getStatus: Ajax.Request.prototype.getStatus,
1376  
1377    getStatusText: function() {
1378      try {
1379        return this.transport.statusText || '';
1380      } catch (e) { return '' }
1381    },
1382  
1383    getHeader: Ajax.Request.prototype.getHeader,
1384  
1385    getAllHeaders: function() {
1386      try {
1387        return this.getAllResponseHeaders();
1388      } catch (e) { return null }
1389    },
1390  
1391    getResponseHeader: function(name) {
1392      return this.transport.getResponseHeader(name);
1393    },
1394  
1395    getAllResponseHeaders: function() {
1396      return this.transport.getAllResponseHeaders();
1397    },
1398  
1399    _getHeaderJSON: function() {
1400      var json = this.getHeader('X-JSON');
1401      if (!json) return null;
1402      json = decodeURIComponent(escape(json));
1403      try {
1404        return json.evalJSON(this.request.options.sanitizeJSON ||
1405          !this.request.isSameOrigin());
1406      } catch (e) {
1407        this.request.dispatchException(e);
1408      }
1409    },
1410  
1411    _getResponseJSON: function() {
1412      var options = this.request.options;
1413      if (!options.evalJSON || (options.evalJSON != 'force' &&
1414        !(this.getHeader('Content-type') || '').include('application/json')) ||
1415          this.responseText.blank())
1416            return null;
1417      try {
1418        return this.responseText.evalJSON(options.sanitizeJSON ||
1419          !this.request.isSameOrigin());
1420      } catch (e) {
1421        this.request.dispatchException(e);
1422      }
1423    }
1424  });
1425  
1426  Ajax.Updater = Class.create(Ajax.Request, {
1427    initialize: function($super, container, url, options) {
1428      this.container = {
1429        success: (container.success || container),
1430        failure: (container.failure || (container.success ? null : container))
1431      };
1432  
1433      options = Object.clone(options);
1434      var onComplete = options.onComplete;
1435      options.onComplete = (function(response, json) {
1436        this.updateContent(response.responseText);
1437        if (Object.isFunction(onComplete)) onComplete(response, json);
1438      }).bind(this);
1439  
1440      $super(url, options);
1441    },
1442  
1443    updateContent: function(responseText) {
1444      var receiver = this.container[this.success() ? 'success' : 'failure'],
1445          options = this.options;
1446  
1447      if (!options.evalScripts) responseText = responseText.stripScripts();
1448  
1449      if (receiver = $(receiver)) {
1450        if (options.insertion) {
1451          if (Object.isString(options.insertion)) {
1452            var insertion = { }; insertion[options.insertion] = responseText;
1453            receiver.insert(insertion);
1454          }
1455          else options.insertion(receiver, responseText);
1456        }
1457        else receiver.update(responseText);
1458      }
1459    }
1460  });
1461  
1462  Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
1463    initialize: function($super, container, url, options) {
1464      $super(options);
1465      this.onComplete = this.options.onComplete;
1466  
1467      this.frequency = (this.options.frequency || 2);
1468      this.decay = (this.options.decay || 1);
1469  
1470      this.updater = { };
1471      this.container = container;
1472      this.url = url;
1473  
1474      this.start();
1475    },
1476  
1477    start: function() {
1478      this.options.onComplete = this.updateComplete.bind(this);
1479      this.onTimerEvent();
1480    },
1481  
1482    stop: function() {
1483      this.updater.options.onComplete = undefined;
1484      clearTimeout(this.timer);
1485      (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
1486    },
1487  
1488    updateComplete: function(response) {
1489      if (this.options.decay) {
1490        this.decay = (response.responseText == this.lastText ?
1491          this.decay * this.options.decay : 1);
1492  
1493        this.lastText = response.responseText;
1494      }
1495      this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
1496    },
1497  
1498    onTimerEvent: function() {
1499      this.updater = new Ajax.Updater(this.container, this.url, this.options);
1500    }
1501  });
1502  function $(element) {
1503    if (arguments.length > 1) {
1504      for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1505        elements.push($(arguments[i]));
1506      return elements;
1507    }
1508    if (Object.isString(element))
1509      element = document.getElementById(element);
1510    return Element.extend(element);
1511  }
1512  
1513  if (Prototype.BrowserFeatures.XPath) {
1514    document._getElementsByXPath = function(expression, parentElement) {
1515      var results = [];
1516      var query = document.evaluate(expression, $(parentElement) || document,
1517        null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
1518      for (var i = 0, length = query.snapshotLength; i < length; i++)
1519        results.push(Element.extend(query.snapshotItem(i)));
1520      return results;
1521    };
1522  }
1523  
1524  /*--------------------------------------------------------------------------*/
1525  
1526  if (!window.Node) var Node = { };
1527  
1528  if (!Node.ELEMENT_NODE) {
1529    // DOM level 2 ECMAScript Language Binding
1530    Object.extend(Node, {
1531      ELEMENT_NODE: 1,
1532      ATTRIBUTE_NODE: 2,
1533      TEXT_NODE: 3,
1534      CDATA_SECTION_NODE: 4,
1535      ENTITY_REFERENCE_NODE: 5,
1536      ENTITY_NODE: 6,
1537      PROCESSING_INSTRUCTION_NODE: 7,
1538      COMMENT_NODE: 8,
1539      DOCUMENT_NODE: 9,
1540      DOCUMENT_TYPE_NODE: 10,
1541      DOCUMENT_FRAGMENT_NODE: 11,
1542      NOTATION_NODE: 12
1543    });
1544  }
1545  
1546  (function() {
1547    var element = this.Element;
1548    this.Element = function(tagName, attributes) {
1549      attributes = attributes || { };
1550      tagName = tagName.toLowerCase();
1551      var cache = Element.cache;
1552      if (Prototype.Browser.IE && attributes.name) {
1553        tagName = '<' + tagName + ' name="' + attributes.name + '">';
1554        delete attributes.name;
1555        return Element.writeAttribute(document.createElement(tagName), attributes);
1556      }
1557      if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
1558      return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
1559    };
1560    Object.extend(this.Element, element || { });
1561  }).call(window);
1562  
1563  Element.cache = { };
1564  
1565  Element.Methods = {
1566    visible: function(element) {
1567      return $(element).style.display != 'none';
1568    },
1569  
1570    toggle: function(element) {
1571      element = $(element);
1572      Element[Element.visible(element) ? 'hide' : 'show'](element);
1573      return element;
1574    },
1575  
1576    hide: function(element) {
1577      $(element).style.display = 'none';
1578      return element;
1579    },
1580  
1581    show: function(element) {
1582      $(element).style.display = '';
1583      return element;
1584    },
1585  
1586    remove: function(element) {
1587      element = $(element);
1588      element.parentNode.removeChild(element);
1589      return element;
1590    },
1591  
1592    update: function(element, content) {
1593      element = $(element);
1594      if (content && content.toElement) content = content.toElement();
1595      if (Object.isElement(content)) return element.update().insert(content);
1596      content = Object.toHTML(content);
1597      element.innerHTML = content.stripScripts();
1598      content.evalScripts.bind(content).defer();
1599      return element;
1600    },
1601  
1602    replace: function(element, content) {
1603      element = $(element);
1604      if (content && content.toElement) content = content.toElement();
1605      else if (!Object.isElement(content)) {
1606        content = Object.toHTML(content);
1607        var range = element.ownerDocument.createRange();
1608        range.selectNode(element);
1609        content.evalScripts.bind(content).defer();
1610        content = range.createContextualFragment(content.stripScripts());
1611      }
1612      element.parentNode.replaceChild(content, element);
1613      return element;
1614    },
1615  
1616    insert: function(element, insertions) {
1617      element = $(element);
1618  
1619      if (Object.isString(insertions) || Object.isNumber(insertions) ||
1620          Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
1621            insertions = {bottom:insertions};
1622  
1623      var content, insert, tagName, childNodes;
1624  
1625      for (var position in insertions) {
1626        content  = insertions[position];
1627        position = position.toLowerCase();
1628        insert = Element._insertionTranslations[position];
1629  
1630        if (content && content.toElement) content = content.toElement();
1631        if (Object.isElement(content)) {
1632          insert(element, content);
1633          continue;
1634        }
1635  
1636        content = Object.toHTML(content);
1637  
1638        tagName = ((position == 'before' || position == 'after')
1639          ? element.parentNode : element).tagName.toUpperCase();
1640  
1641        childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
1642  
1643        if (position == 'top' || position == 'after') childNodes.reverse();
1644        childNodes.each(insert.curry(element));
1645  
1646        content.evalScripts.bind(content).defer();
1647      }
1648  
1649      return element;
1650    },
1651  
1652    wrap: function(element, wrapper, attributes) {
1653      element = $(element);
1654      if (Object.isElement(wrapper))
1655        $(wrapper).writeAttribute(attributes || { });
1656      else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
1657      else wrapper = new Element('div', wrapper);
1658      if (element.parentNode)
1659        element.parentNode.replaceChild(wrapper, element);
1660      wrapper.appendChild(element);
1661      return wrapper;
1662    },
1663  
1664    inspect: function(element) {
1665      element = $(element);
1666      var result = '<' + element.tagName.toLowerCase();
1667      $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1668        var property = pair.first(), attribute = pair.last();
1669        var value = (element[property] || '').toString();
1670        if (value) result += ' ' + attribute + '=' + value.inspect(true);
1671      });
1672      return result + '>';
1673    },
1674  
1675    recursivelyCollect: function(element, property) {
1676      element = $(element);
1677      var elements = [];
1678      while (element = element[property])
1679        if (element.nodeType == 1)
1680          elements.push(Element.extend(element));
1681      return elements;
1682    },
1683  
1684    ancestors: function(element) {
1685      return $(element).recursivelyCollect('parentNode');
1686    },
1687  
1688    descendants: function(element) {
1689      return $(element).select("*");
1690    },
1691  
1692    firstDescendant: function(element) {
1693      element = $(element).firstChild;
1694      while (element && element.nodeType != 1) element = element.nextSibling;
1695      return $(element);
1696    },
1697  
1698    immediateDescendants: function(element) {
1699      if (!(element = $(element).firstChild)) return [];
1700      while (element && element.nodeType != 1) element = element.nextSibling;
1701      if (element) return [element].concat($(element).nextSiblings());
1702      return [];
1703    },
1704  
1705    previousSiblings: function(element) {
1706      return $(element).recursivelyCollect('previousSibling');
1707    },
1708  
1709    nextSiblings: function(element) {
1710      return $(element).recursivelyCollect('nextSibling');
1711    },
1712  
1713    siblings: function(element) {
1714      element = $(element);
1715      return element.previousSiblings().reverse().concat(element.nextSiblings());
1716    },
1717  
1718    match: function(element, selector) {
1719      if (Object.isString(selector))
1720        selector = new Selector(selector);
1721      return selector.match($(element));
1722    },
1723  
1724    up: function(element, expression, index) {
1725      element = $(element);
1726      if (arguments.length == 1) return $(element.parentNode);
1727      var ancestors = element.ancestors();
1728      return Object.isNumber(expression) ? ancestors[expression] :
1729        Selector.findElement(ancestors, expression, index);
1730    },
1731  
1732    down: function(element, expression, index) {
1733      element = $(element);
1734      if (arguments.length == 1) return element.firstDescendant();
1735      return Object.isNumber(expression) ? element.descendants()[expression] :
1736        element.select(expression)[index || 0];
1737    },
1738  
1739    previous: function(element, expression, index) {
1740      element = $(element);
1741      if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
1742      var previousSiblings = element.previousSiblings();
1743      return Object.isNumber(expression) ? previousSiblings[expression] :
1744        Selector.findElement(previousSiblings, expression, index);
1745    },
1746  
1747    next: function(element, expression, index) {
1748      element = $(element);
1749      if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
1750      var nextSiblings = element.nextSiblings();
1751      return Object.isNumber(expression) ? nextSiblings[expression] :
1752        Selector.findElement(nextSiblings, expression, index);
1753    },
1754  
1755    select: function() {
1756      var args = $A(arguments), element = $(args.shift());
1757      return Selector.findChildElements(element, args);
1758    },
1759  
1760    adjacent: function() {
1761      var args = $A(arguments), element = $(args.shift());
1762      return Selector.findChildElements(element.parentNode, args).without(element);
1763    },
1764  
1765    identify: function(element) {
1766      element = $(element);
1767      var id = element.readAttribute('id'), self = arguments.callee;
1768      if (id) return id;
1769      do { id = 'anonymous_element_' + self.counter++ } while ($(id));
1770      element.writeAttribute('id', id);
1771      return id;
1772    },
1773  
1774    readAttribute: function(element, name) {
1775      element = $(element);
1776      if (Prototype.Browser.IE) {
1777        var t = Element._attributeTranslations.read;
1778        if (t.values[name]) return t.values[name](element, name);
1779        if (t.names[name]) name = t.names[name];
1780        if (name.include(':')) {
1781          return (!element.attributes || !element.attributes[name]) ? null :
1782           element.attributes[name].value;
1783        }
1784      }
1785      return element.getAttribute(name);
1786    },
1787  
1788    writeAttribute: function(element, name, value) {
1789      element = $(element);
1790      var attributes = { }, t = Element._attributeTranslations.write;
1791  
1792      if (typeof name == 'object') attributes = name;
1793      else attributes[name] = Object.isUndefined(value) ? true : value;
1794  
1795      for (var attr in attributes) {
1796        name = t.names[attr] || attr;
1797        value = attributes[attr];
1798        if (t.values[attr]) name = t.values[attr](element, value);
1799        if (value === false || value === null)
1800          element.removeAttribute(name);
1801        else if (value === true)
1802          element.setAttribute(name, name);
1803        else element.setAttribute(name, value);
1804      }
1805      return element;
1806    },
1807  
1808    getHeight: function(element) {
1809      return $(element).getDimensions().height;
1810    },
1811  
1812    getWidth: function(element) {
1813      return $(element).getDimensions().width;
1814    },
1815  
1816    classNames: function(element) {
1817      return new Element.ClassNames(element);
1818    },
1819  
1820    hasClassName: function(element, className) {
1821      if (!(element = $(element))) return;
1822      var elementClassName = element.className;
1823      return (elementClassName.length > 0 && (elementClassName == className ||
1824        new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
1825    },
1826  
1827    addClassName: function(element, className) {
1828      if (!(element = $(element))) return;
1829      if (!element.hasClassName(className))
1830        element.className += (element.className ? ' ' : '') + className;
1831      return element;
1832    },
1833  
1834    removeClassName: function(element, className) {
1835      if (!(element = $(element))) return;
1836      element.className = element.className.replace(
1837        new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
1838      return element;
1839    },
1840  
1841    toggleClassName: function(element, className) {
1842      if (!(element = $(element))) return;
1843      return element[element.hasClassName(className) ?
1844        'removeClassName' : 'addClassName'](className);
1845    },
1846  
1847    // removes whitespace-only text node children
1848    cleanWhitespace: function(element) {
1849      element = $(element);
1850      var node = element.firstChild;
1851      while (node) {
1852        var nextNode = node.nextSibling;
1853        if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1854          element.removeChild(node);
1855        node = nextNode;
1856      }
1857      return element;
1858    },
1859  
1860    empty: function(element) {
1861      return $(element).innerHTML.blank();
1862    },
1863  
1864    descendantOf: function(element, ancestor) {
1865      element = $(element), ancestor = $(ancestor);
1866      var originalAncestor = ancestor;
1867  
1868      if (element.compareDocumentPosition)
1869        return (element.compareDocumentPosition(ancestor) & 8) === 8;
1870  
1871      if (element.sourceIndex && !Prototype.Browser.Opera) {
1872        var e = element.sourceIndex, a = ancestor.sourceIndex,
1873         nextAncestor = ancestor.nextSibling;
1874        if (!nextAncestor) {
1875          do { ancestor = ancestor.parentNode; }
1876          while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
1877        }
1878        if (nextAncestor && nextAncestor.sourceIndex)
1879         return (e > a && e < nextAncestor.sourceIndex);
1880      }
1881  
1882      while (element = element.parentNode)
1883        if (element == originalAncestor) return true;
1884      return false;
1885    },
1886  
1887    scrollTo: function(element) {
1888      element = $(element);
1889      var pos = element.cumulativeOffset();
1890      window.scrollTo(pos[0], pos[1]);
1891      return element;
1892    },
1893  
1894    getStyle: function(element, style) {
1895      element = $(element);
1896      style = style == 'float' ? 'cssFloat' : style.camelize();
1897      var value = element.style[style];
1898      if (!value) {
1899        var css = document.defaultView.getComputedStyle(element, null);
1900        value = css ? css[style] : null;
1901      }
1902      if (style == 'opacity') return value ? parseFloat(value) : 1.0;
1903      return value == 'auto' ? null : value;
1904    },
1905  
1906    getOpacity: function(element) {
1907      return $(element).getStyle('opacity');
1908    },
1909  
1910    setStyle: function(element, styles) {
1911      element = $(element);
1912      var elementStyle = element.style, match;
1913      if (Object.isString(styles)) {
1914        element.style.cssText += ';' + styles;
1915        return styles.include('opacity') ?
1916          element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
1917      }
1918      for (var property in styles)
1919        if (property == 'opacity') element.setOpacity(styles[property]);
1920        else
1921          elementStyle[(property == 'float' || property == 'cssFloat') ?
1922            (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
1923              property] = styles[property];
1924  
1925      return element;
1926    },
1927  
1928    setOpacity: function(element, value) {
1929      element = $(element);
1930      element.style.opacity = (value == 1 || value === '') ? '' :
1931        (value < 0.00001) ? 0 : value;
1932      return element;
1933    },
1934  
1935    getDimensions: function(element) {
1936      element = $(element);
1937      var display = $(element).getStyle('display');
1938      if (display != 'none' && display != null) // Safari bug
1939        return {width: element.offsetWidth, height: element.offsetHeight};
1940  
1941      // All *Width and *Height properties give 0 on elements with display none,
1942      // so enable the element temporarily
1943      var els = element.style;
1944      var originalVisibility = els.visibility;
1945      var originalPosition = els.position;
1946      var originalDisplay = els.display;
1947      els.visibility = 'hidden';
1948      els.position = 'absolute';
1949      els.display = 'block';
1950      var originalWidth = element.clientWidth;
1951      var originalHeight = element.clientHeight;
1952      els.display = originalDisplay;
1953      els.position = originalPosition;
1954      els.visibility = originalVisibility;
1955      return {width: originalWidth, height: originalHeight};
1956    },
1957  
1958    makePositioned: function(element) {
1959      element = $(element);
1960      var pos = Element.getStyle(element, 'position');
1961      if (pos == 'static' || !pos) {
1962        element._madePositioned = true;
1963        element.style.position = 'relative';
1964        // Opera returns the offset relative to the positioning context, when an
1965        // element is position relative but top and left have not been defined
1966        if (window.opera) {
1967          element.style.top = 0;
1968          element.style.left = 0;
1969        }
1970      }
1971      return element;
1972    },
1973  
1974    undoPositioned: function(element) {
1975      element = $(element);
1976      if (element._madePositioned) {
1977        element._madePositioned = undefined;
1978        element.style.position =
1979          element.style.top =
1980          element.style.left =
1981          element.style.bottom =
1982          element.style.right = '';
1983      }
1984      return element;
1985    },
1986  
1987    makeClipping: function(element) {
1988      element = $(element);
1989      if (element._overflow) return element;
1990      element._overflow = Element.getStyle(element, 'overflow') || 'auto';
1991      if (element._overflow !== 'hidden')
1992        element.style.overflow = 'hidden';
1993      return element;
1994    },
1995  
1996    undoClipping: function(element) {
1997      element = $(element);
1998      if (!element._overflow) return element;
1999      element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
2000      element._overflow = null;
2001      return element;
2002    },
2003  
2004    cumulativeOffset: function(element) {
2005      var valueT = 0, valueL = 0;
2006      do {
2007        valueT += element.offsetTop  || 0;
2008        valueL += element.offsetLeft || 0;
2009        element = element.offsetParent;
2010      } while (element);
2011      return Element._returnOffset(valueL, valueT);
2012    },
2013  
2014    positionedOffset: function(element) {
2015      var valueT = 0, valueL = 0;
2016      do {
2017        valueT += element.offsetTop  || 0;
2018        valueL += element.offsetLeft || 0;
2019        element = element.offsetParent;
2020        if (element) {
2021          if (element.tagName == 'BODY') break;
2022          var p = Element.getStyle(element, 'position');
2023          if (p !== 'static') break;
2024        }
2025      } while (element);
2026      return Element._returnOffset(valueL, valueT);
2027    },
2028  
2029    absolutize: function(element) {
2030      element = $(element);
2031      if (element.getStyle('position') == 'absolute') return;
2032      // Position.prepare(); // To be done manually by Scripty when it needs it.
2033  
2034      var offsets = element.positionedOffset();
2035      var top     = offsets[1];
2036      var left    = offsets[0];
2037      var width   = element.clientWidth;
2038      var height  = element.clientHeight;
2039  
2040      element._originalLeft   = left - parseFloat(element.style.left  || 0);
2041      element._originalTop    = top  - parseFloat(element.style.top || 0);
2042      element._originalWidth  = element.style.width;
2043      element._originalHeight = element.style.height;
2044  
2045      element.style.position = 'absolute';
2046      element.style.top    = top + 'px';
2047      element.style.left   = left + 'px';
2048      element.style.width  = width + 'px';
2049      element.style.height = height + 'px';
2050      return element;
2051    },
2052  
2053    relativize: function(element) {
2054      element = $(element);
2055      if (element.getStyle('position') == 'relative') return;
2056      // Position.prepare(); // To be done manually by Scripty when it needs it.
2057  
2058      element.style.position = 'relative';
2059      var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
2060      var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
2061  
2062      element.style.top    = top + 'px';
2063      element.style.left   = left + 'px';
2064      element.style.height = element._originalHeight;
2065      element.style.width  = element._originalWidth;
2066      return element;
2067    },
2068  
2069    cumulativeScrollOffset: function(element) {
2070      var valueT = 0, valueL = 0;
2071      do {
2072        valueT += element.scrollTop  || 0;
2073        valueL += element.scrollLeft || 0;
2074        element = element.parentNode;
2075      } while (element);
2076      return Element._returnOffset(valueL, valueT);
2077    },
2078  
2079    getOffsetParent: function(element) {
2080      if (element.offsetParent) return $(element.offsetParent);
2081      if (element == document.body) return $(element);
2082  
2083      while ((element = element.parentNode) && element != document.body)
2084        if (Element.getStyle(element, 'position') != 'static')
2085          return $(element);
2086  
2087      return $(document.body);
2088    },
2089  
2090    viewportOffset: function(forElement) {
2091      var valueT = 0, valueL = 0;
2092  
2093      var element = forElement;
2094      do {
2095        valueT += element.offsetTop  || 0;
2096        valueL += element.offsetLeft || 0;
2097  
2098        // Safari fix
2099        if (element.offsetParent == document.body &&
2100          Element.getStyle(element, 'position') == 'absolute') break;
2101  
2102      } while (element = element.offsetParent);
2103  
2104      element = forElement;
2105      do {
2106        if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
2107          valueT -= element.scrollTop  || 0;
2108          valueL -= element.scrollLeft || 0;
2109        }
2110      } while (element = element.parentNode);
2111  
2112      return Element._returnOffset(valueL, valueT);
2113    },
2114  
2115    clonePosition: function(element, source) {
2116      var options = Object.extend({
2117        setLeft:    true,
2118        setTop:     true,
2119        setWidth:   true,
2120        setHeight:  true,
2121        offsetTop:  0,
2122        offsetLeft: 0
2123      }, arguments[2] || { });
2124  
2125      // find page position of source
2126      source = $(source);
2127      var p = source.viewportOffset();
2128  
2129      // find coordinate system to use
2130      element = $(element);
2131      var delta = [0, 0];
2132      var parent = null;
2133      // delta [0,0] will do fine with position: fixed elements,
2134      // position:absolute needs offsetParent deltas
2135      if (Element.getStyle(element, 'position') == 'absolute') {
2136        parent = element.getOffsetParent();
2137        delta = parent.viewportOffset();
2138      }
2139  
2140      // correct by body offsets (fixes Safari)
2141      if (parent == document.body) {
2142        delta[0] -= document.body.offsetLeft;
2143        delta[1] -= document.body.offsetTop;
2144      }
2145  
2146      // set position
2147      if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
2148      if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
2149      if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
2150      if (options.setHeight) element.style.height = source.offsetHeight + 'px';
2151      return element;
2152    }
2153  };
2154  
2155  Element.Methods.identify.counter = 1;
2156  
2157  Object.extend(Element.Methods, {
2158    getElementsBySelector: Element.Methods.select,
2159    childElements: Element.Methods.immediateDescendants
2160  });
2161  
2162  Element._attributeTranslations = {
2163    write: {
2164      names: {
2165        className: 'class',
2166        htmlFor:   'for'
2167      },
2168      values: { }
2169    }
2170  };
2171  
2172  if (Prototype.Browser.Opera) {
2173    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
2174      function(proceed, element, style) {
2175        switch (style) {
2176          case 'left': case 'top': case 'right': case 'bottom':
2177            if (proceed(element, 'position') === 'static') return null;
2178          case 'height': case 'width':
2179            // returns '0px' for hidden elements; we want it to return null
2180            if (!Element.visible(element)) return null;
2181  
2182            // returns the border-box dimensions rather than the content-box
2183            // dimensions, so we subtract padding and borders from the value
2184            var dim = parseInt(proceed(element, style), 10);
2185  
2186            if (dim !== element['offset' + style.capitalize()])
2187              return dim + 'px';
2188  
2189            var properties;
2190            if (style === 'height') {
2191              properties = ['border-top-width', 'padding-top',
2192               'padding-bottom', 'border-bottom-width'];
2193            }
2194            else {
2195              properties = ['border-left-width', 'padding-left',
2196               'padding-right', 'border-right-width'];
2197            }
2198            return properties.inject(dim, function(memo, property) {
2199              var val = proceed(element, property);
2200              return val === null ? memo : memo - parseInt(val, 10);
2201            }) + 'px';
2202          default: return proceed(element, style);
2203        }
2204      }
2205    );
2206  
2207    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
2208      function(proceed, element, attribute) {
2209        if (attribute === 'title') return element.title;
2210        return proceed(element, attribute);
2211      }
2212    );
2213  }
2214  
2215  else if (Prototype.Browser.IE) {
2216    // IE doesn't report offsets correctly for static elements, so we change them
2217    // to "relative" to get the values, then change them back.
2218    Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
2219      function(proceed, element) {
2220        element = $(element);
2221        var position = element.getStyle('position');
2222        if (position !== 'static') return proceed(element);
2223        element.setStyle({ position: 'relative' });
2224        var value = proceed(element);
2225        element.setStyle({ position: position });
2226        return value;
2227      }
2228    );
2229  
2230    $w('positionedOffset viewportOffset').each(function(method) {
2231      Element.Methods[method] = Element.Methods[method].wrap(
2232        function(proceed, element) {
2233          element = $(element);
2234          var position = element.getStyle('position');
2235          if (position !== 'static') return proceed(element);
2236          // Trigger hasLayout on the offset parent so that IE6 reports
2237          // accurate offsetTop and offsetLeft values for position: fixed.
2238          var offsetParent = element.getOffsetParent();
2239          if (offsetParent && offsetParent.getStyle('position') === 'fixed')
2240            offsetParent.setStyle({ zoom: 1 });
2241          element.setStyle({ position: 'relative' });
2242          var value = proceed(element);
2243          element.setStyle({ position: position });
2244          return value;
2245        }
2246      );
2247    });
2248  
2249    Element.Methods.getStyle = function(element, style) {
2250      element = $(element);
2251      style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
2252      var value = element.style[style];
2253      if (!value && element.currentStyle) value = element.currentStyle[style];
2254  
2255      if (style == 'opacity') {
2256        if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
2257          if (value[1]) return parseFloat(value[1]) / 100;
2258        return 1.0;
2259      }
2260  
2261      if (value == 'auto') {
2262        if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
2263          return element['offset' + style.capitalize()] + 'px';
2264        return null;
2265      }
2266      return value;
2267    };
2268  
2269    Element.Methods.setOpacity = function(element, value) {
2270      function stripAlpha(filter){
2271        return filter.replace(/alpha\([^\)]*\)/gi,'');
2272      }
2273      element = $(element);
2274      var currentStyle = element.currentStyle;
2275      if ((currentStyle && !currentStyle.hasLayout) ||
2276        (!currentStyle && element.style.zoom == 'normal'))
2277          element.style.zoom = 1;
2278  
2279      var filter = element.getStyle('filter'), style = element.style;
2280      if (value == 1 || value === '') {
2281        (filter = stripAlpha(filter)) ?
2282          style.filter = filter : style.removeAttribute('filter');
2283        return element;
2284      } else if (value < 0.00001) value = 0;
2285      style.filter = stripAlpha(filter) +
2286        'alpha(opacity=' + (value * 100) + ')';
2287      return element;
2288    };
2289  
2290    Element._attributeTranslations = {
2291      read: {
2292        names: {
2293          'class': 'className',
2294          'for':   'htmlFor'
2295        },
2296        values: {
2297          _getAttr: function(element, attribute) {
2298            return element.getAttribute(attribute, 2);
2299          },
2300          _getAttrNode: function(element, attribute) {
2301            var node = element.getAttributeNode(attribute);
2302            return node ? node.value : "";
2303          },
2304          _getEv: function(element, attribute) {
2305            attribute = element.getAttribute(attribute);
2306            return attribute ? attribute.toString().slice(23, -2) : null;
2307          },
2308          _flag: function(element, attribute) {
2309            return $(element).hasAttribute(attribute) ? attribute : null;
2310          },
2311          style: function(element) {
2312            return element.style.cssText.toLowerCase();
2313          },
2314          title: function(element) {
2315            return element.title;
2316          }
2317        }
2318      }
2319    };
2320  
2321    Element._attributeTranslations.write = {
2322      names: Object.extend({
2323        cellpadding: 'cellPadding',
2324        cellspacing: 'cellSpacing'
2325      }, Element._attributeTranslations.read.names),
2326      values: {
2327        checked: function(element, value) {
2328          element.checked = !!value;
2329        },
2330  
2331        style: function(element, value) {
2332          element.style.cssText = value ? value : '';
2333        }
2334      }
2335    };
2336  
2337    Element._attributeTranslations.has = {};
2338  
2339    $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
2340        'encType maxLength readOnly longDesc').each(function(attr) {
2341      Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
2342      Element._attributeTranslations.has[attr.toLowerCase()] = attr;
2343    });
2344  
2345    (function(v) {
2346      Object.extend(v, {
2347        href:        v._getAttr,
2348        src:         v._getAttr,
2349        type:        v._getAttr,
2350        action:      v._getAttrNode,
2351        disabled:    v._flag,
2352        checked:     v._flag,
2353        readonly:    v._flag,
2354        multiple:    v._flag,
2355        onload:      v._getEv,
2356        onunload:    v._getEv,
2357        onclick:     v._getEv,
2358        ondblclick:  v._getEv,
2359        onmousedown: v._getEv,
2360        onmouseup:   v._getEv,
2361        onmouseover: v._getEv,
2362        onmousemove: v._getEv,
2363        onmouseout:  v._getEv,
2364        onfocus:     v._getEv,
2365        onblur:      v._getEv,
2366        onkeypress:  v._getEv,
2367        onkeydown:   v._getEv,
2368        onkeyup:     v._getEv,
2369        onsubmit:    v._getEv,
2370        onreset:     v._getEv,
2371        onselect:    v._getEv,
2372        onchange:    v._getEv
2373      });
2374    })(Element._attributeTranslations.read.values);
2375  }
2376  
2377  else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
2378    Element.Methods.setOpacity = function(element, value) {
2379      element = $(element);
2380      element.style.opacity = (value == 1) ? 0.999999 :
2381        (value === '') ? '' : (value < 0.00001) ? 0 : value;
2382      return element;
2383    };
2384  }
2385  
2386  else if (Prototype.Browser.WebKit) {
2387    Element.Methods.setOpacity = function(element, value) {
2388      element = $(element);
2389      element.style.opacity = (value == 1 || value === '') ? '' :
2390        (value < 0.00001) ? 0 : value;
2391  
2392      if (value == 1)
2393        if(element.tagName == 'IMG' && element.width) {
2394          element.width++; element.width--;
2395        } else try {
2396          var n = document.createTextNode(' ');
2397          element.appendChild(n);
2398          element.removeChild(n);
2399        } catch (e) { }
2400  
2401      return element;
2402    };
2403  
2404    // Safari returns margins on body which is incorrect if the child is absolutely
2405    // positioned.  For performance reasons, redefine Element#cumulativeOffset for
2406    // KHTML/WebKit only.
2407    Element.Methods.cumulativeOffset = function(element) {
2408      var valueT = 0, valueL = 0;
2409      do {
2410        valueT += element.offsetTop  || 0;
2411        valueL += element.offsetLeft || 0;
2412        if (element.offsetParent == document.body)
2413          if (Element.getStyle(element, 'position') == 'absolute') break;
2414  
2415        element = element.offsetParent;
2416      } while (element);
2417  
2418      return Element._returnOffset(valueL, valueT);
2419    };
2420  }
2421  
2422  if (Prototype.Browser.IE || Prototype.Browser.Opera) {
2423    // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
2424    Element.Methods.update = function(element, content) {
2425      element = $(element);
2426  
2427      if (content && content.toElement) content = content.toElement();
2428      if (Object.isElement(content)) return element.update().insert(content);
2429  
2430      content = Object.toHTML(content);
2431      var tagName = element.tagName.toUpperCase();
2432  
2433      if (tagName in Element._insertionTranslations.tags) {
2434        $A(element.childNodes).each(function(node) { element.removeChild(node) });
2435        Element._getContentFromAnonymousElement(tagName, content.stripScripts())
2436          .each(function(node) { element.appendChild(node) });
2437      }
2438      else element.innerHTML = content.stripScripts();
2439  
2440      content.evalScripts.bind(content).defer();
2441      return element;
2442    };
2443  }
2444  
2445  if ('outerHTML' in document.createElement('div')) {
2446    Element.Methods.replace = function(element, content) {
2447      element = $(element);
2448  
2449      if (content && content.toElement) content = content.toElement();
2450      if (Object.isElement(content)) {
2451        element.parentNode.replaceChild(content, element);
2452        return element;
2453      }
2454  
2455      content = Object.toHTML(content);
2456      var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
2457  
2458      if (Element._insertionTranslations.tags[tagName]) {
2459        var nextSibling = element.next();
2460        var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
2461        parent.removeChild(element);
2462        if (nextSibling)
2463          fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
2464        else
2465          fragments.each(function(node) { parent.appendChild(node) });
2466      }
2467      else element.outerHTML = content.stripScripts();
2468  
2469      content.evalScripts.bind(content).defer();
2470      return element;
2471    };
2472  }
2473  
2474  Element._returnOffset = function(l, t) {
2475    var result = [l, t];
2476    result.left = l;
2477    result.top = t;
2478    return result;
2479  };
2480  
2481  Element._getContentFromAnonymousElement = function(tagName, html) {
2482    var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
2483    if (t) {
2484      div.innerHTML = t[0] + html + t[1];
2485      t[2].times(function() { div = div.firstChild });
2486    } else div.innerHTML = html;
2487    return $A(div.childNodes);
2488  };
2489  
2490  Element._insertionTranslations = {
2491    before: function(element, node) {
2492      element.parentNode.insertBefore(node, element);
2493    },
2494    top: function(element, node) {
2495      element.insertBefore(node, element.firstChild);
2496    },
2497    bottom: function(element, node) {
2498      element.appendChild(node);
2499    },
2500    after: function(element, node) {
2501      element.parentNode.insertBefore(node, element.nextSibling);
2502    },
2503    tags: {
2504      TABLE:  ['<table>',                '</table>',                   1],
2505      TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
2506      TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
2507      TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
2508      SELECT: ['<select>',               '</select>',                  1]
2509    }
2510  };
2511  
2512  (function() {
2513    Object.extend(this.tags, {
2514      THEAD: this.tags.TBODY,
2515      TFOOT: this.tags.TBODY,
2516      TH:    this.tags.TD
2517    });
2518  }).call(Element._insertionTranslations);
2519  
2520  Element.Methods.Simulated = {
2521    hasAttribute: function(element, attribute) {
2522      attribute = Element._attributeTranslations.has[attribute] || attribute;
2523      var node = $(element).getAttributeNode(attribute);
2524      return node && node.specified;
2525    }
2526  };
2527  
2528  Element.Methods.ByTag = { };
2529  
2530  Object.extend(Element, Element.Methods);
2531  
2532  if (!Prototype.BrowserFeatures.ElementExtensions &&
2533      document.createElement('div').__proto__) {
2534    window.HTMLElement = { };
2535    window.HTMLElement.prototype = document.createElement('div').__proto__;
2536    Prototype.BrowserFeatures.ElementExtensions = true;
2537  }
2538  
2539  Element.extend = (function() {
2540    if (Prototype.BrowserFeatures.SpecificElementExtensions)
2541      return Prototype.K;
2542  
2543    var Methods = { }, ByTag = Element.Methods.ByTag;
2544  
2545    var extend = Object.extend(function(element) {
2546      if (!element || element._extendedByPrototype ||
2547          element.nodeType != 1 || element == window) return element;
2548  
2549      var methods = Object.clone(Methods),
2550        tagName = element.tagName, property, value;
2551  
2552      // extend methods for specific tags
2553      if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
2554  
2555      for (property in methods) {
2556        value = methods[property];
2557        if (Object.isFunction(value) && !(property in element))
2558          element[property] = value.methodize();
2559      }
2560  
2561      element._extendedByPrototype = Prototype.emptyFunction;
2562      return element;
2563  
2564    }, {
2565      refresh: function() {
2566        // extend methods for all tags (Safari doesn't need this)
2567        if (!Prototype.BrowserFeatures.ElementExtensions) {
2568          Object.extend(Methods, Element.Methods);
2569          Object.extend(Methods, Element.Methods.Simulated);
2570        }
2571      }
2572    });
2573  
2574    extend.refresh();
2575    return extend;
2576  })();
2577  
2578  Element.hasAttribute = function(element, attribute) {
2579    if (element.hasAttribute) return element.hasAttribute(attribute);
2580    return Element.Methods.Simulated.hasAttribute(element, attribute);
2581  };
2582  
2583  Element.addMethods = function(methods) {
2584    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
2585  
2586    if (!methods) {
2587      Object.extend(Form, Form.Methods);
2588      Object.extend(Form.Element, Form.Element.Methods);
2589      Object.extend(Element.Methods.ByTag, {
2590        "FORM":     Object.clone(Form.Methods),
2591        "INPUT":    Object.clone(Form.Element.Methods),
2592        "SELECT":   Object.clone(Form.Element.Methods),
2593        "TEXTAREA": Object.clone(Form.Element.Methods)
2594      });
2595    }
2596  
2597    if (arguments.length == 2) {
2598      var tagName = methods;
2599      methods = arguments[1];
2600    }
2601  
2602    if (!tagName) Object.extend(Element.Methods, methods || { });
2603    else {
2604      if (Object.isArray(tagName)) tagName.each(extend);
2605      else extend(tagName);
2606    }
2607  
2608    function extend(tagName) {
2609      tagName = tagName.toUpperCase();
2610      if (!Element.Methods.ByTag[tagName])
2611        Element.Methods.ByTag[tagName] = { };
2612      Object.extend(Element.Methods.ByTag[tagName], methods);
2613    }
2614  
2615    function copy(methods, destination, onlyIfAbsent) {
2616      onlyIfAbsent = onlyIfAbsent || false;
2617      for (var property in methods) {
2618        var value = methods[property];
2619        if (!Object.isFunction(value)) continue;
2620        if (!onlyIfAbsent || !(property in destination))
2621          destination[property] = value.methodize();
2622      }
2623    }
2624  
2625    function findDOMClass(tagName) {
2626      var klass;
2627      var trans = {
2628        "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
2629        "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
2630        "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
2631        "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
2632        "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
2633        "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
2634        "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
2635        "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
2636        "FrameSet", "IFRAME": "IFrame"
2637      };
2638      if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
2639      if (window[klass]) return window[klass];
2640      klass = 'HTML' + tagName + 'Element';
2641      if (window[klass]) return window[klass];
2642      klass = 'HTML' + tagName.capitalize() + 'Element';
2643      if (window[klass]) return window[klass];
2644  
2645      window[klass] = { };
2646      window[klass].prototype = document.createElement(tagName).__proto__;
2647      return window[klass];
2648    }
2649  
2650    if (F.ElementExtensions) {
2651      copy(Element.Methods, HTMLElement.prototype);
2652      copy(Element.Methods.Simulated, HTMLElement.prototype, true);
2653    }
2654  
2655    if (F.SpecificElementExtensions) {
2656      for (var tag in Element.Methods.ByTag) {
2657        var klass = findDOMClass(tag);
2658        if (Object.isUndefined(klass)) continue;
2659        copy(T[tag], klass.prototype);
2660      }
2661    }
2662  
2663    Object.extend(Element, Element.Methods);
2664    delete Element.ByTag;
2665  
2666    if (Element.extend.refresh) Element.extend.refresh();
2667    Element.cache = { };
2668  };
2669  
2670  document.viewport = {
2671    getDimensions: function() {
2672      var dimensions = { };
2673      var B = Prototype.Browser;
2674      $w('width height').each(function(d) {
2675        var D = d.capitalize();
2676        dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
2677          (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
2678      });
2679      return dimensions;
2680    },
2681  
2682    getWidth: function() {
2683      return this.getDimensions().width;
2684    },
2685  
2686    getHeight: function() {
2687      return this.getDimensions().height;
2688    },
2689  
2690    getScrollOffsets: function() {
2691      return Element._returnOffset(
2692        window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
2693        window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
2694    }
2695  };
2696  /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
2697   * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
2698   * license.  Please see http://www.yui-ext.com/ for more information. */
2699  
2700  var Selector = Class.create({
2701    initialize: function(expression) {
2702      this.expression = expression.strip();
2703      this.compileMatcher();
2704    },
2705  
2706    shouldUseXPath: function() {
2707      if (!Prototype.BrowserFeatures.XPath) return false;
2708  
2709      var e = this.expression;
2710  
2711      // Safari 3 chokes on :*-of-type and :empty
2712      if (Prototype.Browser.WebKit &&
2713       (e.include("-of-type") || e.include(":empty")))
2714        return false;
2715  
2716      // XPath can't do namespaced attributes, nor can it read
2717      // the "checked" property from DOM nodes
2718      if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
2719        return false;
2720  
2721      return true;
2722    },
2723  
2724    compileMatcher: function() {
2725      if (this.shouldUseXPath())
2726        return this.compileXPathMatcher();
2727  
2728      var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
2729          c = Selector.criteria, le, p, m;
2730  
2731      if (Selector._cache[e]) {
2732        this.matcher = Selector._cache[e];
2733        return;
2734      }
2735  
2736      this.matcher = ["this.matcher = function(root) {",
2737                      "var r = root, h = Selector.handlers, c = false, n;"];
2738  
2739      while (e && le != e && (/\S/).test(e)) {
2740        le = e;
2741        for (var i in ps) {
2742          p = ps[i];
2743          if (m = e.match(p)) {
2744            this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
2745                new Template(c[i]).evaluate(m));
2746            e = e.replace(m[0], '');
2747            break;
2748          }
2749        }
2750      }
2751  
2752      this.matcher.push("return h.unique(n);\n}");
2753      eval(this.matcher.join('\n'));
2754      Selector._cache[this.expression] = this.matcher;
2755    },
2756  
2757    compileXPathMatcher: function() {
2758      var e = this.expression, ps = Selector.patterns,
2759          x = Selector.xpath, le, m;
2760  
2761      if (Selector._cache[e]) {
2762        this.xpath = Selector._cache[e]; return;
2763      }
2764  
2765      this.matcher = ['.//*'];
2766      while (e && le != e && (/\S/).test(e)) {
2767        le = e;
2768        for (var i in ps) {
2769          if (m = e.match(ps[i])) {
2770            this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
2771              new Template(x[i]).evaluate(m));
2772            e = e.replace(m[0], '');
2773            break;
2774          }
2775        }
2776      }
2777  
2778      this.xpath = this.matcher.join('');
2779      Selector._cache[this.expression] = this.xpath;
2780    },
2781  
2782    findElements: function(root) {
2783      root = root || document;
2784      if (this.xpath) return document._getElementsByXPath(this.xpath, root);
2785      return this.matcher(root);
2786    },
2787  
2788    match: function(element) {
2789      this.tokens = [];
2790  
2791      var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
2792      var le, p, m;
2793  
2794      while (e && le !== e && (/\S/).test(e)) {
2795        le = e;
2796        for (var i in ps) {
2797          p = ps[i];
2798          if (m = e.match(p)) {
2799            // use the Selector.assertions methods unless the selector
2800            // is too complex.
2801            if (as[i]) {
2802              this.tokens.push([i, Object.clone(m)]);
2803              e = e.replace(m[0], '');
2804            } else {
2805              // reluctantly do a document-wide search
2806              // and look for a match in the array
2807              return this.findElements(document).include(element);
2808            }
2809          }
2810        }
2811      }
2812  
2813      var match = true, name, matches;
2814      for (var i = 0, token; token = this.tokens[i]; i++) {
2815        name = token[0], matches = token[1];
2816        if (!Selector.assertions[name](element, matches)) {
2817          match = false; break;
2818        }
2819      }
2820  
2821      return match;
2822    },
2823  
2824    toString: function() {
2825      return this.expression;
2826    },
2827  
2828    inspect: function() {
2829      return "#<Selector:" + this.expression.inspect() + ">";
2830    }
2831  });
2832  
2833  Object.extend(Selector, {
2834    _cache: { },
2835  
2836    xpath: {
2837      descendant:   "//*",
2838      child:        "/*",
2839      adjacent:     "/following-sibling::*[1]",
2840      laterSibling: '/following-sibling::*',
2841      tagName:      function(m) {
2842        if (m[1] == '*') return '';
2843        return "[local-name()='" + m[1].toLowerCase() +
2844               "' or local-name()='" + m[1].toUpperCase() + "']";
2845      },
2846      className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
2847      id:           "[@id='#{1}']",
2848      attrPresence: function(m) {
2849        m[1] = m[1].toLowerCase();
2850        return new Template("[@#{1}]").evaluate(m);
2851      },
2852      attr: function(m) {
2853        m[1] = m[1].toLowerCase();
2854        m[3] = m[5] || m[6];
2855        return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
2856      },
2857      pseudo: function(m) {
2858        var h = Selector.xpath.pseudos[m[1]];
2859        if (!h) return '';
2860        if (Object.isFunction(h)) return h(m);
2861        return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
2862      },
2863      operators: {
2864        '=':  "[@#{1}='#{3}']",
2865        '!=': "[@#{1}!='#{3}']",
2866        '^=': "[starts-with(@#{1}, '#{3}')]",
2867        '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
2868        '*=': "[contains(@#{1}, '#{3}')]",
2869        '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
2870        '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
2871      },
2872      pseudos: {
2873        'first-child': '[not(preceding-sibling::*)]',
2874        'last-child':  '[not(following-sibling::*)]',
2875        'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
2876        'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
2877        'checked':     "[@checked]",
2878        'disabled':    "[@disabled]",
2879        'enabled':     "[not(@disabled)]",
2880        'not': function(m) {
2881          var e = m[6], p = Selector.patterns,
2882              x = Selector.xpath, le, v;
2883  
2884          var exclusion = [];
2885          while (e && le != e && (/\S/).test(e)) {
2886            le = e;
2887            for (var i in p) {
2888              if (m = e.match(p[i])) {
2889                v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
2890                exclusion.push("(" + v.substring(1, v.length - 1) + ")");
2891                e = e.replace(m[0], '');
2892                break;
2893              }
2894            }
2895          }
2896          return "[not(" + exclusion.join(" and ") + ")]";
2897        },
2898        'nth-child':      function(m) {
2899          return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
2900        },
2901        'nth-last-child': function(m) {
2902          return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
2903        },
2904        'nth-of-type':    function(m) {
2905          return Selector.xpath.pseudos.nth("position() ", m);
2906        },
2907        'nth-last-of-type': function(m) {
2908          return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
2909        },
2910        'first-of-type':  function(m) {
2911          m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
2912        },
2913        'last-of-type':   function(m) {
2914          m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
2915        },
2916        'only-of-type':   function(m) {
2917          var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
2918        },
2919        nth: function(fragment, m) {
2920          var mm, formula = m[6], predicate;
2921          if (formula == 'even') formula = '2n+0';
2922          if (formula == 'odd')  formula = '2n+1';
2923          if (mm = formula.match(/^(\d+)$/)) // digit only
2924            return '[' + fragment + "= " + mm[1] + ']';
2925          if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2926            if (mm[1] == "-") mm[1] = -1;
2927            var a = mm[1] ? Number(mm[1]) : 1;
2928            var b = mm[2] ? Number(mm[2]) : 0;
2929            predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
2930            "((#{fragment} - #{b}) div #{a} >= 0)]";
2931            return new Template(predicate).evaluate({
2932              fragment: fragment, a: a, b: b });
2933          }
2934        }
2935      }
2936    },
2937  
2938    criteria: {
2939      tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
2940      className:    'n = h.className(n, r, "#{1}", c);    c = false;',
2941      id:           'n = h.id(n, r, "#{1}", c);           c = false;',
2942      attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
2943      attr: function(m) {
2944        m[3] = (m[5] || m[6]);
2945        return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
2946      },
2947      pseudo: function(m) {
2948        if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
2949        return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
2950      },
2951      descendant:   'c = "descendant";',
2952      child:        'c = "child";',
2953      adjacent:     'c = "adjacent";',
2954      laterSibling: 'c = "laterSibling";'
2955    },
2956  
2957    patterns: {
2958      // combinators must be listed first
2959      // (and descendant needs to be last combinator)
2960      laterSibling: /^\s*~\s*/,
2961      child:        /^\s*>\s*/,
2962      adjacent:     /^\s*\+\s*/,
2963      descendant:   /^\s/,
2964  
2965      // selectors follow
2966      tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
2967      id:           /^#([\w\-\*]+)(\b|$)/,
2968      className:    /^\.([\w\-\*]+)(\b|$)/,
2969      pseudo:
2970  /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
2971      attrPresence: /^\[([\w]+)\]/,
2972      attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
2973    },
2974  
2975    // for Selector.match and Element#match
2976    assertions: {
2977      tagName: function(element, matches) {
2978        return matches[1].toUpperCase() == element.tagName.toUpperCase();
2979      },
2980  
2981      className: function(element, matches) {
2982        return Element.hasClassName(element, matches[1]);
2983      },
2984  
2985      id: function(element, matches) {
2986        return element.id === matches[1];
2987      },
2988  
2989      attrPresence: function(element, matches) {
2990        return Element.hasAttribute(element, matches[1]);
2991      },
2992  
2993      attr: function(element, matches) {
2994        var nodeValue = Element.readAttribute(element, matches[1]);
2995        return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
2996      }
2997    },
2998  
2999    handlers: {
3000      // UTILITY FUNCTIONS
3001      // joins two collections
3002      concat: function(a, b) {
3003        for (var i = 0, node; node = b[i]; i++)
3004          a.push(node);
3005        return a;
3006      },
3007  
3008      // marks an array of nodes for counting
3009      mark: function(nodes) {
3010        var _true = Prototype.emptyFunction;
3011        for (var i = 0, node; node = nodes[i]; i++)
3012          node._countedByPrototype = _true;
3013        return nodes;
3014      },
3015  
3016      unmark: function(nodes) {
3017        for (var i = 0, node; node = nodes[i]; i++)
3018          node._countedByPrototype = undefined;
3019        return nodes;
3020      },
3021  
3022      // mark each child node with its position (for nth calls)
3023      // "ofType" flag indicates whether we're indexing for nth-of-type
3024      // rather than nth-child
3025      index: function(parentNode, reverse, ofType) {
3026        parentNode._countedByPrototype = Prototype.emptyFunction;
3027        if (reverse) {
3028          for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
3029            var node = nodes[i];
3030            if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
3031          }
3032        } else {
3033          for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
3034            if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
3035        }
3036      },
3037  
3038      // filters out duplicates and extends all nodes
3039      unique: function(nodes) {
3040        if (nodes.length == 0) return nodes;
3041        var results = [], n;
3042        for (var i = 0, l = nodes.length; i < l; i++)
3043          if (!(n = nodes[i])._countedByPrototype) {
3044            n._countedByPrototype = Prototype.emptyFunction;
3045            results.push(Element.extend(n));
3046          }
3047        return Selector.handlers.unmark(results);
3048      },
3049  
3050      // COMBINATOR FUNCTIONS
3051      descendant: function(nodes) {
3052        var h = Selector.handlers;
3053        for (var i = 0, results = [], node; node = nodes[i]; i++)
3054          h.concat(results, node.getElementsByTagName('*'));
3055        return results;
3056      },
3057  
3058      child: function(nodes) {
3059        var h = Selector.handlers;
3060        for (var i = 0, results = [], node; node = nodes[i]; i++) {
3061          for (var j = 0, child; child = node.childNodes[j]; j++)
3062            if (child.nodeType == 1 && child.tagName != '!') results.push(child);
3063        }
3064        return results;
3065      },
3066  
3067      adjacent: function(nodes) {
3068        for (var i = 0, results = [], node; node = nodes[i]; i++) {
3069          var next = this.nextElementSibling(node);
3070          if (next) results.push(next);
3071        }
3072        return results;
3073      },
3074  
3075      laterSibling: function(nodes) {
3076        var h = Selector.handlers;
3077        for (var i = 0, results = [], node; node = nodes[i]; i++)
3078          h.concat(results, Element.nextSiblings(node));
3079        return results;
3080      },
3081  
3082      nextElementSibling: function(node) {
3083        while (node = node.nextSibling)
3084            if (node.nodeType == 1) return node;
3085        return null;
3086      },
3087  
3088      previousElementSibling: function(node) {
3089        while (node = node.previousSibling)
3090          if (node.nodeType == 1) return node;
3091        return null;
3092      },
3093  
3094      // TOKEN FUNCTIONS
3095      tagName: function(nodes, root, tagName, combinator) {
3096        var uTagName = tagName.toUpperCase();
3097        var results = [], h = Selector.handlers;
3098        if (nodes) {
3099          if (combinator) {
3100            // fastlane for ordinary descendant combinators
3101            if (combinator == "descendant") {
3102              for (var i = 0, node; node = nodes[i]; i++)
3103                h.concat(results, node.getElementsByTagName(tagName));
3104              return results;
3105            } else nodes = this[combinator](nodes);
3106            if (tagName == "*") return nodes;
3107          }
3108          for (var i = 0, node; node = nodes[i]; i++)
3109            if (node.tagName.toUpperCase() === uTagName) results.push(node);
3110          return results;
3111        } else return root.getElementsByTagName(tagName);
3112      },
3113  
3114      id: function(nodes, root, id, combinator) {
3115        var targetNode = $(id), h = Selector.handlers;
3116        if (!targetNode) return [];
3117        if (!nodes && root == document) return [targetNode];
3118        if (nodes) {
3119          if (combinator) {
3120            if (combinator == 'child') {
3121              for (var i = 0, node; node = nodes[i]; i++)
3122                if (targetNode.parentNode == node) return [targetNode];
3123            } else if (combinator == 'descendant') {
3124              for (var i = 0, node; node = nodes[i]; i++)
3125                if (Element.descendantOf(targetNode, node)) return [targetNode];
3126            } else if (combinator == 'adjacent') {
3127              for (var i = 0, node; node = nodes[i]; i++)
3128                if (Selector.handlers.previousElementSibling(targetNode) == node)
3129                  return [targetNode];
3130            } else nodes = h[combinator](nodes);
3131          }
3132          for (var i = 0, node; node = nodes[i]; i++)
3133            if (node == targetNode) return [targetNode];
3134          return [];
3135        }
3136        return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
3137      },
3138  
3139      className: function(nodes, root, className, combinator) {
3140        if (nodes && combinator) nodes = this[combinator](nodes);
3141        return Selector.handlers.byClassName(nodes, root, className);
3142      },
3143  
3144      byClassName: function(nodes, root, className) {
3145        if (!nodes) nodes = Selector.handlers.descendant([root]);
3146        var needle = ' ' + className + ' ';
3147        for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
3148          nodeClassName = node.className;
3149          if (nodeClassName.length == 0) continue;
3150          if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
3151            results.push(node);
3152        }
3153        return results;
3154      },
3155  
3156      attrPresence: function(nodes, root, attr, combinator) {
3157        if (!nodes) nodes = root.getElementsByTagName("*");
3158        if (nodes && combinator) nodes = this[combinator](nodes);
3159        var results = [];
3160        for (var i = 0, node; node = nodes[i]; i++)
3161          if (Element.hasAttribute(node, attr)) results.push(node);
3162        return results;
3163      },
3164  
3165      attr: function(nodes, root, attr, value, operator, combinator) {
3166        if (!nodes) nodes = root.getElementsByTagName("*");
3167        if (nodes && combinator) nodes = this[combinator](nodes);
3168        var handler = Selector.operators[operator], results = [];
3169        for (var i = 0, node; node = nodes[i]; i++) {
3170          var nodeValue = Element.readAttribute(node, attr);
3171          if (nodeValue === null) continue;
3172          if (handler(nodeValue, value)) results.push(node);
3173        }
3174        return results;
3175      },
3176  
3177      pseudo: function(nodes, name, value, root, combinator) {
3178        if (nodes && combinator) nodes = this[combinator](nodes);
3179        if (!nodes) nodes = root.getElementsByTagName("*");
3180        return Selector.pseudos[name](nodes, value, root);
3181      }
3182    },
3183  
3184    pseudos: {
3185      'first-child': function(nodes, value, root) {
3186        for (var i = 0, results = [], node; node = nodes[i]; i++) {
3187          if (Selector.handlers.previousElementSibling(node)) continue;
3188            results.push(node);
3189        }
3190        return results;
3191      },
3192      'last-child': function(nodes, value, root) {
3193        for (var i = 0, results = [], node; node = nodes[i]; i++) {
3194          if (Selector.handlers.nextElementSibling(node)) continue;
3195            results.push(node);
3196        }
3197        return results;
3198      },
3199      'only-child': function(nodes, value, root) {
3200        var h = Selector.handlers;
3201        for (var i = 0, results = [], node; node = nodes[i]; i++)
3202          if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
3203            results.push(node);
3204        return results;
3205      },
3206      'nth-child':        function(nodes, formula, root) {
3207        return Selector.pseudos.nth(nodes, formula, root);
3208      },
3209      'nth-last-child':   function(nodes, formula, root) {
3210        return Selector.pseudos.nth(nodes, formula, root, true);
3211      },
3212      'nth-of-type':      function(nodes, formula, root) {
3213        return Selector.pseudos.nth(nodes, formula, root, false, true);
3214      },
3215      'nth-last-of-type': function(nodes, formula, root) {
3216        return Selector.pseudos.nth(nodes, formula, root, true, true);
3217      },
3218      'first-of-type':    function(nodes, formula, root) {
3219        return Selector.pseudos.nth(nodes, "1", root, false, true);
3220      },
3221      'last-of-type':     function(nodes, formula, root) {
3222        return Selector.pseudos.nth(nodes, "1", root, true, true);
3223      },
3224      'only-of-type':     function(nodes, formula, root) {
3225        var p = Selector.pseudos;
3226        return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
3227      },
3228  
3229      // handles the an+b logic
3230      getIndices: function(a, b, total) {
3231        if (a == 0) return b > 0 ? [b] : [];
3232        return $R(1, total).inject([], function(memo, i) {
3233          if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
3234          return memo;
3235        });
3236      },
3237  
3238      // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
3239      nth: function(nodes, formula, root, reverse, ofType) {
3240        if (nodes.length == 0) return [];
3241        if (formula == 'even') formula = '2n+0';
3242        if (formula == 'odd')  formula = '2n+1';
3243        var h = Selector.handlers, results = [], indexed = [], m;
3244        h.mark(nodes);
3245        for (var i = 0, node; node = nodes[i]; i++) {
3246          if (!node.parentNode._countedByPrototype) {
3247            h.index(node.parentNode, reverse, ofType);
3248            indexed.push(node.parentNode);
3249          }
3250        }
3251        if (formula.match(/^\d+$/)) { // just a number
3252          formula = Number(formula);
3253          for (var i = 0, node; node = nodes[i]; i++)
3254            if (node.nodeIndex == formula) results.push(node);
3255        } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
3256          if (m[1] == "-") m[1] = -1;
3257          var a = m[1] ? Number(m[1]) : 1;
3258          var b = m[2] ? Number(m[2]) : 0;
3259          var indices = Selector.pseudos.getIndices(a, b, nodes.length);
3260          for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
3261            for (var j = 0; j < l; j++)
3262              if (node.nodeIndex == indices[j]) results.push(node);
3263          }
3264        }
3265        h.unmark(nodes);
3266        h.unmark(indexed);
3267        return results;
3268      },
3269  
3270      'empty': function(nodes, value, root) {
3271        for (var i = 0, results = [], node; node = nodes[i]; i++) {
3272          // IE treats comments as element nodes
3273          if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
3274          results.push(node);
3275        }
3276        return results;
3277      },
3278  
3279      'not': function(nodes, selector, root) {
3280        var h = Selector.handlers, selectorType, m;
3281        var exclusions = new Selector(selector).findElements(root);
3282        h.mark(exclusions);
3283        for (var i = 0, results = [], node; node = nodes[i]; i++)
3284          if (!node._countedByPrototype) results.push(node);
3285        h.unmark(exclusions);
3286        return results;
3287      },
3288  
3289      'enabled': function(nodes, value, root) {
3290        for (var i = 0, results = [], node; node = nodes[i]; i++)
3291          if (!node.disabled) results.push(node);
3292        return results;
3293      },
3294  
3295      'disabled': function(nodes, value, root) {
3296        for (var i = 0, results = [], node; node = nodes[i]; i++)
3297          if (node.disabled) results.push(node);
3298        return results;
3299      },
3300  
3301      'checked': function(nodes, value, root) {
3302        for (var i = 0, results = [], node; node = nodes[i]; i++)
3303          if (node.checked) results.push(node);
3304        return results;
3305      }
3306    },
3307  
3308    operators: {
3309      '=':  function(nv, v) { return nv == v; },
3310      '!=': function(nv, v) { return nv != v; },
3311      '^=': function(nv, v) { return nv.startsWith(v); },
3312      '$=': function(nv, v) { return nv.endsWith(v); },
3313      '*=': function(nv, v) { return nv.include(v); },
3314      '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
3315      '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
3316    },
3317  
3318    split: function(expression) {
3319      var expressions = [];
3320      expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
3321        expressions.push(m[1].strip());
3322      });
3323      return expressions;
3324    },
3325  
3326    matchElements: function(elements, expression) {
3327      var matches = $$(expression), h = Selector.handlers;
3328      h.mark(matches);
3329      for (var i = 0, results = [], element; element = elements[i]; i++)
3330        if (element._countedByPrototype) results.push(element);
3331      h.unmark(matches);
3332      return results;
3333    },
3334  
3335    findElement: function(elements, expression, index) {
3336      if (Object.isNumber(expression)) {
3337        index = expression; expression = false;
3338      }
3339      return Selector.matchElements(elements, expression || '*')[index || 0];
3340    },
3341  
3342    findChildElements: function(element, expressions) {
3343      expressions = Selector.split(expressions.join(','));
3344      var results = [], h = Selector.handlers;
3345      for (var i = 0, l = expressions.length, selector; i < l; i++) {
3346        selector = new Selector(expressions[i].strip());
3347        h.concat(results, selector.findElements(element));
3348      }
3349      return (l > 1) ? h.unique(results) : results;
3350    }
3351  });
3352  
3353  if (Prototype.Browser.IE) {
3354    Object.extend(Selector.handlers, {
3355      // IE returns comment nodes on getElementsByTagName("*").
3356      // Filter them out.
3357      concat: function(a, b) {
3358        for (var i = 0, node; node = b[i]; i++)
3359          if (node.tagName !== "!") a.push(node);
3360        return a;
3361      },
3362  
3363      // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
3364      unmark: function(nodes) {
3365        for (var i = 0, node; node = nodes[i]; i++)
3366          node.removeAttribute('_countedByPrototype');
3367        return nodes;
3368      }
3369    });
3370  }
3371  
3372  function $$() {
3373    return Selector.findChildElements(document, $A(arguments));
3374  }
3375  var Form = {
3376    reset: function(form) {
3377      $(form).reset();
3378      return form;
3379    },
3380  
3381    serializeElements: function(elements, options) {
3382      if (typeof options != 'object') options = { hash: !!options };
3383      else if (Object.isUndefined(options.hash)) options.hash = true;
3384      var key, value, submitted = false, submit = options.submit;
3385  
3386      var data = elements.inject({ }, function(result, element) {
3387        if (!element.disabled && element.name) {
3388          key = element.name; value = $(element).getValue();
3389          if (value != null && (element.type != 'submit' || (!submitted &&
3390              submit !== false && (!submit || key == submit) && (submitted = true)))) {
3391            if (key in result) {
3392              // a key is already present; construct an array of values
3393              if (!Object.isArray(result[key])) result[key] = [result[key]];
3394              result[key].push(value);
3395            }
3396            else result[key] = value;
3397          }
3398        }
3399        return result;
3400      });
3401  
3402      return options.hash ? data : Object.toQueryString(data);
3403    }
3404  };
3405  
3406  Form.Methods = {
3407    serialize: function(form, options) {
3408      return Form.serializeElements(Form.getElements(form), options);
3409    },
3410  
3411    getElements: function(form) {
3412      return $A($(form).getElementsByTagName('*')).inject([],
3413        function(elements, child) {
3414          if (Form.Element.Serializers[child.tagName.toLowerCase()])
3415            elements.push(Element.extend(child));
3416          return elements;
3417        }
3418      );
3419    },
3420  
3421    getInputs: function(form, typeName, name) {
3422      form = $(form);
3423      var inputs = form.getElementsByTagName('input');
3424  
3425      if (!typeName && !name) return $A(inputs).map(Element.extend);
3426  
3427      for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
3428        var input = inputs[i];
3429        if ((typeName && input.type != typeName) || (name && input.name != name))
3430          continue;
3431        matchingInputs.push(Element.extend(input));
3432      }
3433  
3434      return matchingInputs;
3435    },
3436  
3437    disable: function(form) {
3438      form = $(form);
3439      Form.getElements(form).invoke('disable');
3440      return form;
3441    },
3442  
3443    enable: function(form) {
3444      form = $(form);
3445      Form.getElements(form).invoke('enable');
3446      return form;
3447    },
3448  
3449    findFirstElement: function(form) {
3450      var elements = $(form).getElements().findAll(function(element) {
3451        return 'hidden' != element.type && !element.disabled;
3452      });
3453      var firstByIndex = elements.findAll(function(element) {
3454        return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
3455      }).sortBy(function(element) { return element.tabIndex }).first();
3456  
3457      return firstByIndex ? firstByIndex : elements.find(function(element) {
3458        return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
3459      });
3460    },
3461  
3462    focusFirstElement: function(form) {
3463      form = $(form);
3464      form.findFirstElement().activate();
3465      return form;
3466    },
3467  
3468    request: function(form, options) {
3469      form = $(form), options = Object.clone(options || { });
3470  
3471      var params = options.parameters, action = form.readAttribute('action') || '';
3472      if (action.blank()) action = window.location.href;
3473      options.parameters = form.serialize(true);
3474  
3475      if (params) {
3476        if (Object.isString(params)) params = params.toQueryParams();
3477        Object.extend(options.parameters, params);
3478      }
3479  
3480      if (form.hasAttribute('method') && !options.method)
3481        options.method = form.method;
3482  
3483      return new Ajax.Request(action, options);
3484    }
3485  };
3486  
3487  /*--------------------------------------------------------------------------*/
3488  
3489  Form.Element = {
3490    focus: function(element) {
3491      $(element).focus();
3492      return element;
3493    },
3494  
3495    select: function(element) {
3496      $(element).select();
3497      return element;
3498    }
3499  };
3500  
3501  Form.Element.Methods = {
3502    serialize: function(element) {
3503      element = $(element);
3504      if (!element.disabled && element.name) {
3505        var value = element.getValue();
3506        if (value != undefined) {
3507          var pair = { };
3508          pair[element.name] = value;
3509          return Object.toQueryString(pair);
3510        }
3511      }
3512      return '';
3513    },
3514  
3515    getValue: function(element) {
3516      element = $(element);
3517      var method = element.tagName.toLowerCase();
3518      return Form.Element.Serializers[method](element);
3519    },
3520  
3521    setValue: function(element, value) {
3522      element = $(element);
3523      var method = element.tagName.toLowerCase();
3524      Form.Element.Serializers[method](element, value);
3525      return element;
3526    },
3527  
3528    clear: function(element) {
3529      $(element).value = '';
3530      return element;
3531    },
3532  
3533    present: function(element) {
3534      return $(element).value != '';
3535    },
3536  
3537    activate: function(element) {
3538      element = $(element);
3539      try {
3540        element.focus();
3541        if (element.select && (element.tagName.toLowerCase() != 'input' ||
3542            !['button', 'reset', 'submit'].include(element.type)))
3543          element.select();
3544      } catch (e) { }
3545      return element;
3546    },
3547  
3548    disable: function(element) {
3549      element = $(element);
3550      element.blur();
3551      element.disabled = true;
3552      return element;
3553    },
3554  
3555    enable: function(element) {
3556      element = $(element);
3557      element.disabled = false;
3558      return element;
3559    }
3560  };
3561  
3562  /*--------------------------------------------------------------------------*/
3563  
3564  var Field = Form.Element;
3565  var $F = Form.Element.Methods.getValue;
3566  
3567  /*--------------------------------------------------------------------------*/
3568  
3569  Form.Element.Serializers = {
3570    input: function(element, value) {
3571      switch (element.type.toLowerCase()) {
3572        case 'checkbox':
3573        case 'radio':
3574          return Form.Element.Serializers.inputSelector(element, value);
3575        default:
3576          return Form.Element.Serializers.textarea(element, value);
3577      }
3578    },
3579  
3580    inputSelector: function(element, value) {
3581      if (Object.isUndefined(value)) return element.checked ? element.value : null;
3582      else element.checked = !!value;
3583    },
3584  
3585    textarea: function(element, value) {
3586      if (Object.isUndefined(value)) return element.value;
3587      else element.value = value;
3588    },
3589  
3590    select: function(element, index) {
3591      if (Object.isUndefined(index))
3592        return this[element.type == 'select-one' ?
3593          'selectOne' : 'selectMany'](element);
3594      else {
3595        var opt, value, single = !Object.isArray(index);
3596        for (var i = 0, length = element.length; i < length; i++) {
3597          opt = element.options[i];
3598          value = this.optionValue(opt);
3599          if (single) {
3600            if (value == index) {
3601              opt.selected = true;
3602              return;
3603            }
3604          }
3605          else opt.selected = index.include(value);
3606        }
3607      }
3608    },
3609  
3610    selectOne: function(element) {
3611      var index = element.selectedIndex;
3612      return index >= 0 ? this.optionValue(element.options[index]) : null;
3613    },
3614  
3615    selectMany: function(element) {
3616      var values, length = element.length;
3617      if (!length) return null;
3618  
3619      for (var i = 0, values = []; i < length; i++) {
3620        var opt = element.options[i];
3621        if (opt.selected) values.push(this.optionValue(opt));
3622      }
3623      return values;
3624    },
3625  
3626    optionValue: function(opt) {
3627      // extend element because hasAttribute may not be native
3628      return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
3629    }
3630  };
3631  
3632  /*--------------------------------------------------------------------------*/
3633  
3634  Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
3635    initialize: function($super, element, frequency, callback) {
3636      $super(callback, frequency);
3637      this.element   = $(element);
3638      this.lastValue = this.getValue();
3639    },
3640  
3641    execute: function() {
3642      var value = this.getValue();
3643      if (Object.isString(this.lastValue) && Object.isString(value) ?
3644          this.lastValue != value : String(this.lastValue) != String(value)) {
3645        this.callback(this.element, value);
3646        this.lastValue = value;
3647      }
3648    }
3649  });
3650  
3651  Form.Element.Observer = Class.create(Abstract.TimedObserver, {
3652    getValue: function() {
3653      return Form.Element.getValue(this.element);
3654    }
3655  });
3656  
3657  Form.Observer = Class.create(Abstract.TimedObserver, {
3658    getValue: function() {
3659      return Form.serialize(this.element);
3660    }
3661  });
3662  
3663  /*--------------------------------------------------------------------------*/
3664  
3665  Abstract.EventObserver = Class.create({
3666    initialize: function(element, callback) {
3667      this.element  = $(element);
3668      this.callback = callback;
3669  
3670      this.lastValue = this.getValue();
3671      if (this.element.tagName.toLowerCase() == 'form')
3672        this.registerFormCallbacks();
3673      else
3674        this.registerCallback(this.element);
3675    },
3676  
3677    onElementEvent: function() {
3678      var value = this.getValue();
3679      if (this.lastValue != value) {
3680        this.callback(this.element, value);
3681        this.lastValue = value;
3682      }
3683    },
3684  
3685    registerFormCallbacks: function() {
3686      Form.getElements(this.element).each(this.registerCallback, this);
3687    },
3688  
3689    registerCallback: function(element) {
3690      if (element.type) {
3691        switch (element.type.toLowerCase()) {
3692          case 'checkbox':
3693          case 'radio':
3694            Event.observe(element, 'click', this.onElementEvent.bind(this));
3695            break;
3696          default:
3697            Event.observe(element, 'change', this.onElementEvent.bind(this));
3698            break;
3699        }
3700      }
3701    }
3702  });
3703  
3704  Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
3705    getValue: function() {
3706      return Form.Element.getValue(this.element);
3707    }
3708  });
3709  
3710  Form.EventObserver = Class.create(Abstract.EventObserver, {
3711    getValue: function() {
3712      return Form.serialize(this.element);
3713    }
3714  });
3715  if (!window.Event) var Event = { };
3716  
3717  Object.extend(Event, {
3718    KEY_BACKSPACE: 8,
3719    KEY_TAB:       9,
3720    KEY_RETURN:   13,
3721    KEY_ESC:      27,
3722    KEY_LEFT:     37,
3723    KEY_UP:       38,
3724    KEY_RIGHT:    39,
3725    KEY_DOWN:     40,
3726    KEY_DELETE:   46,
3727    KEY_HOME:     36,
3728    KEY_END:      35,
3729    KEY_PAGEUP:   33,
3730    KEY_PAGEDOWN: 34,
3731    KEY_INSERT:   45,
3732  
3733    cache: { },
3734  
3735    relatedTarget: function(event) {
3736      var element;
3737      switch(event.type) {
3738        case 'mouseover': element = event.fromElement; break;
3739        case 'mouseout':  element = event.toElement;   break;
3740        default: return null;
3741      }
3742      return Element.extend(element);
3743    }
3744  });
3745  
3746  Event.Methods = (function() {
3747    var isButton;
3748  
3749    if (Prototype.Browser.IE) {
3750      var buttonMap = { 0: 1, 1: 4, 2: 2 };
3751      isButton = function(event, code) {
3752        return event.button == buttonMap[code];
3753      };
3754  
3755    } else if (Prototype.Browser.WebKit) {
3756      isButton = function(event, code) {
3757        switch (code) {
3758          case 0: return event.which == 1 && !event.metaKey;
3759          case 1: return event.which == 1 && event.metaKey;
3760          default: return false;
3761        }
3762      };
3763  
3764    } else {
3765      isButton = function(event, code) {
3766        return event.which ? (event.which === code + 1) : (event.button === code);
3767      };
3768    }
3769  
3770    return {
3771      isLeftClick:   function(event) { return isButton(event, 0) },
3772      isMiddleClick: function(event) { return isButton(event, 1) },
3773      isRightClick:  function(event) { return isButton(event, 2) },
3774  
3775      element: function(event) {
3776        var node = Event.extend(event).target;
3777        return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
3778      },
3779  
3780      findElement: function(event, expression) {
3781        var element = Event.element(event);
3782        if (!expression) return element;
3783        var elements = [element].concat(element.ancestors());
3784        return Selector.findElement(elements, expression, 0);
3785      },
3786  
3787      pointer: function(event) {
3788        return {
3789          x: event.pageX || (event.clientX +
3790            (document.documentElement.scrollLeft || document.body.scrollLeft)),
3791          y: event.pageY || (event.clientY +
3792            (document.documentElement.scrollTop || document.body.scrollTop))
3793        };
3794      },
3795  
3796      pointerX: function(event) { return Event.pointer(event).x },
3797      pointerY: function(event) { return Event.pointer(event).y },
3798  
3799      stop: function(event) {
3800        Event.extend(event);
3801        event.preventDefault();
3802        event.stopPropagation();
3803        event.stopped = true;
3804      }
3805    };
3806  })();
3807  
3808  Event.extend = (function() {
3809    var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
3810      m[name] = Event.Methods[name].methodize();
3811      return m;
3812    });
3813  
3814    if (Prototype.Browser.IE) {
3815      Object.extend(methods, {
3816        stopPropagation: function() { this.cancelBubble = true },
3817        preventDefault:  function() { this.returnValue = false },
3818        inspect: function() { return "[object Event]" }
3819      });
3820  
3821      return function(event) {
3822        if (!event) return false;
3823        if (event._extendedByPrototype) return event;
3824  
3825        event._extendedByPrototype = Prototype.emptyFunction;
3826        var pointer = Event.pointer(event);
3827        Object.extend(event, {
3828          target: event.srcElement,
3829          relatedTarget: Event.relatedTarget(event),
3830          pageX:  pointer.x,
3831          pageY:  pointer.y
3832        });
3833        return Object.extend(event, methods);
3834      };
3835  
3836    } else {
3837      Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
3838      Object.extend(Event.prototype, methods);
3839      return Prototype.K;
3840    }
3841  })();
3842  
3843  Object.extend(Event, (function() {
3844    var cache = Event.cache;
3845  
3846    function getEventID(element) {
3847      if (element._prototypeEventID) return element._prototypeEventID[0];
3848      arguments.callee.id = arguments.callee.id || 1;
3849      return element._prototypeEventID = [++arguments.callee.id];
3850    }
3851  
3852    function getDOMEventName(eventName) {
3853      if (eventName && eventName.include(':')) return "dataavailable";
3854      return eventName;
3855    }
3856  
3857    function getCacheForID(id) {
3858      return cache[id] = cache[id] || { };
3859    }
3860  
3861    function getWrappersForEventName(id, eventName) {
3862      var c = getCacheForID(id);
3863      return c[eventName] = c[eventName] || [];
3864    }
3865  
3866    function createWrapper(element, eventName, handler) {
3867      var id = getEventID(element);
3868      var c = getWrappersForEventName(id, eventName);
3869      if (c.pluck("handler").include(handler)) return false;
3870  
3871      var wrapper = function(event) {
3872        if (!Event || !Event.extend ||
3873          (event.eventName && event.eventName != eventName))
3874            return false;
3875  
3876        Event.extend(event);
3877        handler.call(element, event);
3878      };
3879  
3880      wrapper.handler = handler;
3881      c.push(wrapper);
3882      return wrapper;
3883    }
3884  
3885    function findWrapper(id, eventName, handler) {
3886      var c = getWrappersForEventName(id, eventName);
3887      return c.find(function(wrapper) { return wrapper.handler == handler });
3888    }
3889  
3890    function destroyWrapper(id, eventName, handler) {
3891      var c = getCacheForID(id);
3892      if (!c[eventName]) return false;
3893      c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
3894    }
3895  
3896    function destroyCache() {
3897      for (var id in cache)
3898        for (var eventName in cache[id])
3899          cache[id][eventName] = null;
3900    }
3901  
3902    if (window.attachEvent) {
3903      window.attachEvent("onunload", destroyCache);
3904    }
3905  
3906    return {
3907      observe: function(element, eventName, handler) {
3908        element = $(element);
3909        var name = getDOMEventName(eventName);
3910  
3911        var wrapper = createWrapper(element, eventName, handler);
3912        if (!wrapper) return element;
3913  
3914        if (element.addEventListener) {
3915          element.addEventListener(name, wrapper, false);
3916        } else {
3917          element.attachEvent("on" + name, wrapper);
3918        }
3919  
3920        return element;
3921      },
3922  
3923      stopObserving: function(element, eventName, handler) {
3924        element = $(element);
3925        var id = getEventID(element), name = getDOMEventName(eventName);
3926  
3927        if (!handler && eventName) {
3928          getWrappersForEventName(id, eventName).each(function(wrapper) {
3929            element.stopObserving(eventName, wrapper.handler);
3930          });
3931          return element;
3932  
3933        } else if (!eventName) {
3934          Object.keys(getCacheForID(id)).each(function(eventName) {
3935            element.stopObserving(eventName);
3936          });
3937          return element;
3938        }
3939  
3940        var wrapper = findWrapper(id, eventName, handler);
3941        if (!wrapper) return element;
3942  
3943        if (element.removeEventListener) {
3944          element.removeEventListener(name, wrapper, false);
3945        } else {
3946          element.detachEvent("on" + name, wrapper);
3947        }
3948  
3949        destroyWrapper(id, eventName, handler);
3950  
3951        return element;
3952      },
3953  
3954      fire: function(element, eventName, memo) {
3955        element = $(element);
3956        if (element == document && document.createEvent && !element.dispatchEvent)
3957          element = document.documentElement;
3958  
3959        var event;
3960        if (document.createEvent) {
3961          event = document.createEvent("HTMLEvents");
3962          event.initEvent("dataavailable", true, true);
3963        } else {
3964          event = document.createEventObject();
3965          event.eventType = "ondataavailable";
3966        }
3967  
3968        event.eventName = eventName;
3969        event.memo = memo || { };
3970  
3971        if (document.createEvent) {
3972          element.dispatchEvent(event);
3973        } else {
3974          element.fireEvent(event.eventType, event);
3975        }
3976  
3977        return Event.extend(event);
3978      }
3979    };
3980  })());
3981  
3982  Object.extend(Event, Event.Methods);
3983  
3984  Element.addMethods({
3985    fire:          Event.fire,
3986    observe:       Event.observe,
3987    stopObserving: Event.stopObserving
3988  });
3989  
3990  Object.extend(document, {
3991    fire:          Element.Methods.fire.methodize(),
3992    observe:       Element.Methods.observe.methodize(),
3993    stopObserving: Element.Methods.stopObserving.methodize(),
3994    loaded:        false
3995  });
3996  
3997  (function() {
3998    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
3999       Matthias Miller, Dean Edwards and John Resig. */
4000  
4001    var timer;
4002  
4003    function fireContentLoadedEvent() {
4004      if (document.loaded) return;
4005      if (timer) window.clearInterval(timer);
4006      document.fire("dom:loaded");
4007      document.loaded = true;
4008    }
4009  
4010    if (document.addEventListener) {
4011      if (Prototype.Browser.WebKit) {
4012        timer = window.setInterval(function() {
4013          if (/loaded|complete/.test(document.readyState))
4014            fireContentLoadedEvent();
4015        }, 0);
4016  
4017        Event.observe(window, "load", fireContentLoadedEvent);
4018  
4019      } else {
4020        document.addEventListener("DOMContentLoaded",
4021          fireContentLoadedEvent, false);
4022      }
4023  
4024    } else {
4025      document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
4026      $("__onDOMContentLoaded").onreadystatechange = function() {
4027        if (this.readyState == "complete") {
4028          this.onreadystatechange = null;
4029          fireContentLoadedEvent();
4030        }
4031      };
4032    }
4033  })();
4034  /*------------------------------- DEPRECATED -------------------------------*/
4035  
4036  Hash.toQueryString = Object.toQueryString;
4037  
4038  var Toggle = { display: Element.toggle };
4039  
4040  Element.Methods.childOf = Element.Methods.descendantOf;
4041  
4042  var Insertion = {
4043    Before: function(element, content) {
4044      return Element.insert(element, {before:content});
4045    },
4046  
4047    Top: function(element, content) {
4048      return Element.insert(element, {top:content});
4049    },
4050  
4051    Bottom: function(element, content) {
4052      return Element.insert(element, {bottom:content});
4053    },
4054  
4055    After: function(element, content) {
4056      return Element.insert(element, {after:content});
4057    }
4058  };
4059  
4060  var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
4061  
4062  // This should be moved to script.aculo.us; notice the deprecated methods
4063  // further below, that map to the newer Element methods.
4064  var Position = {
4065    // set to true if needed, warning: firefox performance problems
4066    // NOT neeeded for page scrolling, only if draggable contained in
4067    // scrollable elements
4068    includeScrollOffsets: false,
4069  
4070    // must be called before calling withinIncludingScrolloffset, every time the
4071    // page is scrolled
4072    prepare: function() {
4073      this.deltaX =  window.pageXOffset
4074                  || document.documentElement.scrollLeft
4075                  || document.body.scrollLeft
4076                  || 0;
4077      this.deltaY =  window.pageYOffset
4078                  || document.documentElement.scrollTop
4079                  || document.body.scrollTop
4080                  || 0;
4081    },
4082  
4083    // caches x/y coordinate pair to use with overlap
4084    within: function(element, x, y) {
4085      if (this.includeScrollOffsets)
4086        return this.withinIncludingScrolloffsets(element, x, y);
4087      this.xcomp = x;
4088      this.ycomp = y;
4089      this.offset = Element.cumulativeOffset(element);
4090  
4091      return (y >= this.offset[1] &&
4092              y <  this.offset[1] + element.offsetHeight &&
4093              x >= this.offset[0] &&
4094              x <  this.offset[0] + element.offsetWidth);
4095    },
4096  
4097    withinIncludingScrolloffsets: function(element, x, y) {
4098      var offsetcache = Element.cumulativeScrollOffset(element);
4099  
4100      this.xcomp = x + offsetcache[0] - this.deltaX;
4101      this.ycomp = y + offsetcache[1] - this.deltaY;
4102      this.offset = Element.cumulativeOffset(element);
4103  
4104      return (this.ycomp >= this.offset[1] &&
4105              this.ycomp <  this.offset[1] + element.offsetHeight &&
4106              this.xcomp >= this.offset[0] &&
4107              this.xcomp <  this.offset[0] + element.offsetWidth);
4108    },
4109  
4110    // within must be called directly before
4111    overlap: function(mode, element) {
4112      if (!mode) return 0;
4113      if (mode == 'vertical')
4114        return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
4115          element.offsetHeight;
4116      if (mode == 'horizontal')
4117        return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
4118          element.offsetWidth;
4119    },
4120  
4121    // Deprecation layer -- use newer Element methods now (1.5.2).
4122  
4123    cumulativeOffset: Element.Methods.cumulativeOffset,
4124  
4125    positionedOffset: Element.Methods.positionedOffset,
4126  
4127    absolutize: function(element) {
4128      Position.prepare();
4129      return Element.absolutize(element);
4130    },
4131  
4132    relativize: function(element) {
4133      Position.prepare();
4134      return Element.relativize(element);
4135    },
4136  
4137    realOffset: Element.Methods.cumulativeScrollOffset,
4138  
4139    offsetParent: Element.Methods.getOffsetParent,
4140  
4141    page: Element.Methods.viewportOffset,
4142  
4143    clone: function(source, target, options) {
4144      options = options || { };
4145      return Element.clonePosition(target, source, options);
4146    }
4147  };
4148  
4149  /*--------------------------------------------------------------------------*/
4150  
4151  if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
4152    function iter(name) {
4153      return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
4154    }
4155  
4156    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
4157    function(element, className) {
4158      className = className.toString().strip();
4159      var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
4160      return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
4161    } : function(element, className) {
4162      className = className.toString().strip();
4163      var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
4164      if (!classNames && !className) return elements;
4165  
4166      var nodes = $(element).getElementsByTagName('*');
4167      className = ' ' + className + ' ';
4168  
4169      for (var i = 0, child, cn; child = nodes[i]; i++) {
4170        if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
4171            (classNames && classNames.all(function(name) {
4172              return !name.toString().blank() && cn.include(' ' + name + ' ');
4173            }))))
4174          elements.push(Element.extend(child));
4175      }
4176      return elements;
4177    };
4178  
4179    return function(className, parentElement) {
4180      return $(parentElement || document.body).getElementsByClassName(className);
4181    };
4182  }(Element.Methods);
4183  
4184  /*--------------------------------------------------------------------------*/
4185  
4186  Element.ClassNames = Class.create();
4187  Element.ClassNames.prototype = {
4188    initialize: function(element) {
4189      this.element = $(element);
4190    },
4191  
4192    _each: function(iterator) {
4193      this.element.className.split(/\s+/).select(function(name) {
4194        return name.length > 0;
4195      })._each(iterator);
4196    },
4197  
4198    set: function(className) {
4199      this.element.className = className;
4200    },
4201  
4202    add: function(classNameToAdd) {
4203      if (this.include(classNameToAdd)) return;
4204      this.set($A(this).concat(classNameToAdd).join(' '));
4205    },
4206  
4207    remove: function(classNameToRemove) {
4208      if (!this.include(classNameToRemove)) return;
4209      this.set($A(this).without(classNameToRemove).join(' '));
4210    },
4211  
4212    toString: function() {
4213      return $A(this).join(' ');
4214    }
4215  };
4216  
4217  Object.extend(Element.ClassNames.prototype, Enumerable);
4218  
4219  /*--------------------------------------------------------------------------*/
4220  
4221  Element.addMethods();