[Sommaire] [Imprimer]

   1  /*  Prototype JavaScript framework, version 1.5.1.1
   2   *  (c) 2005-2007 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: '1.5.1.1',
  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    },
  18  
  19    BrowserFeatures: {
  20      XPath: !!document.evaluate,
  21      ElementExtensions: !!window.HTMLElement,
  22      SpecificElementExtensions:
  23        (document.createElement('div').__proto__ !==
  24         document.createElement('form').__proto__)
  25    },
  26  
  27    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  28    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
  29  
  30    emptyFunction: function() { },
  31    K: function(x) { return x }
  32  }
  33  
  34  var Class = {
  35    create: function() {
  36      return function() {
  37        this.initialize.apply(this, arguments);
  38      }
  39    }
  40  }
  41  
  42  var Abstract = new Object();
  43  
  44  Object.extend = function(destination, source) {
  45    for (var property in source) {
  46      destination[property] = source[property];
  47    }
  48    return destination;
  49  }
  50  
  51  Object.extend(Object, {
  52    inspect: function(object) {
  53      try {
  54        if (object === undefined) return 'undefined';
  55        if (object === null) return 'null';
  56        return object.inspect ? object.inspect() : object.toString();
  57      } catch (e) {
  58        if (e instanceof RangeError) return '...';
  59        throw e;
  60      }
  61    },
  62  
  63    toJSON: function(object) {
  64      var type = typeof object;
  65      switch(type) {
  66        case 'undefined':
  67        case 'function':
  68        case 'unknown': return;
  69        case 'boolean': return object.toString();
  70      }
  71      if (object === null) return 'null';
  72      if (object.toJSON) return object.toJSON();
  73      if (object.ownerDocument === document) return;
  74      var results = [];
  75      for (var property in object) {
  76        var value = Object.toJSON(object[property]);
  77        if (value !== undefined)
  78          results.push(property.toJSON() + ': ' + value);
  79      }
  80      return '{' + results.join(', ') + '}';
  81    },
  82  
  83    keys: function(object) {
  84      var keys = [];
  85      for (var property in object)
  86        keys.push(property);
  87      return keys;
  88    },
  89  
  90    values: function(object) {
  91      var values = [];
  92      for (var property in object)
  93        values.push(object[property]);
  94      return values;
  95    },
  96  
  97    clone: function(object) {
  98      return Object.extend({}, object);
  99    }
 100  });
 101  
 102  Function.prototype.bind = function() {
 103    var __method = this, args = $A(arguments), object = args.shift();
 104    return function() {
 105      return __method.apply(object, args.concat($A(arguments)));
 106    }
 107  }
 108  
 109  Function.prototype.bindAsEventListener = function(object) {
 110    var __method = this, args = $A(arguments), object = args.shift();
 111    return function(event) {
 112      return __method.apply(object, [event || window.event].concat(args));
 113    }
 114  }
 115  
 116  Object.extend(Number.prototype, {
 117    toColorPart: function() {
 118      return this.toPaddedString(2, 16);
 119    },
 120  
 121    succ: function() {
 122      return this + 1;
 123    },
 124  
 125    times: function(iterator) {
 126      $R(0, this, true).each(iterator);
 127      return this;
 128    },
 129  
 130    toPaddedString: function(length, radix) {
 131      var string = this.toString(radix || 10);
 132      return '0'.times(length - string.length) + string;
 133    },
 134  
 135    toJSON: function() {
 136      return isFinite(this) ? this.toString() : 'null';
 137    }
 138  });
 139  
 140  Date.prototype.toJSON = function() {
 141    return '"' + this.getFullYear() + '-' +
 142      (this.getMonth() + 1).toPaddedString(2) + '-' +
 143      this.getDate().toPaddedString(2) + 'T' +
 144      this.getHours().toPaddedString(2) + ':' +
 145      this.getMinutes().toPaddedString(2) + ':' +
 146      this.getSeconds().toPaddedString(2) + '"';
 147  };
 148  
 149  var Try = {
 150    these: function() {
 151      var returnValue;
 152  
 153      for (var i = 0, length = arguments.length; i < length; i++) {
 154        var lambda = arguments[i];
 155        try {
 156          returnValue = lambda();
 157          break;
 158        } catch (e) {}
 159      }
 160  
 161      return returnValue;
 162    }
 163  }
 164  
 165  /*--------------------------------------------------------------------------*/
 166  
 167  var PeriodicalExecuter = Class.create();
 168  PeriodicalExecuter.prototype = {
 169    initialize: function(callback, frequency) {
 170      this.callback = callback;
 171      this.frequency = frequency;
 172      this.currentlyExecuting = false;
 173  
 174      this.registerCallback();
 175    },
 176  
 177    registerCallback: function() {
 178      this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 179    },
 180  
 181    stop: function() {
 182      if (!this.timer) return;
 183      clearInterval(this.timer);
 184      this.timer = null;
 185    },
 186  
 187    onTimerEvent: function() {
 188      if (!this.currentlyExecuting) {
 189        try {
 190          this.currentlyExecuting = true;
 191          this.callback(this);
 192        } finally {
 193          this.currentlyExecuting = false;
 194        }
 195      }
 196    }
 197  }
 198  Object.extend(String, {
 199    interpret: function(value) {
 200      return value == null ? '' : String(value);
 201    },
 202    specialChar: {
 203      '\b': '\\b',
 204      '\t': '\\t',
 205      '\n': '\\n',
 206      '\f': '\\f',
 207      '\r': '\\r',
 208      '\\': '\\\\'
 209    }
 210  });
 211  
 212  Object.extend(String.prototype, {
 213    gsub: function(pattern, replacement) {
 214      var result = '', source = this, match;
 215      replacement = arguments.callee.prepareReplacement(replacement);
 216  
 217      while (source.length > 0) {
 218        if (match = source.match(pattern)) {
 219          result += source.slice(0, match.index);
 220          result += String.interpret(replacement(match));
 221          source  = source.slice(match.index + match[0].length);
 222        } else {
 223          result += source, source = '';
 224        }
 225      }
 226      return result;
 227    },
 228  
 229    sub: function(pattern, replacement, count) {
 230      replacement = this.gsub.prepareReplacement(replacement);
 231      count = count === undefined ? 1 : count;
 232  
 233      return this.gsub(pattern, function(match) {
 234        if (--count < 0) return match[0];
 235        return replacement(match);
 236      });
 237    },
 238  
 239    scan: function(pattern, iterator) {
 240      this.gsub(pattern, iterator);
 241      return this;
 242    },
 243  
 244    truncate: function(length, truncation) {
 245      length = length || 30;
 246      truncation = truncation === undefined ? '...' : truncation;
 247      return this.length > length ?
 248        this.slice(0, length - truncation.length) + truncation : this;
 249    },
 250  
 251    strip: function() {
 252      return this.replace(/^\s+/, '').replace(/\s+$/, '');
 253    },
 254  
 255    stripTags: function() {
 256      return this.replace(/<\/?[^>]+>/gi, '');
 257    },
 258  
 259    stripScripts: function() {
 260      return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
 261    },
 262  
 263    extractScripts: function() {
 264      var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
 265      var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
 266      return (this.match(matchAll) || []).map(function(scriptTag) {
 267        return (scriptTag.match(matchOne) || ['', ''])[1];
 268      });
 269    },
 270  
 271    evalScripts: function() {
 272      return this.extractScripts().map(function(script) { return eval(script) });
 273    },
 274  
 275    escapeHTML: function() {
 276      var self = arguments.callee;
 277      self.text.data = this;
 278      return self.div.innerHTML;
 279    },
 280  
 281    unescapeHTML: function() {
 282      var div = document.createElement('div');
 283      div.innerHTML = this.stripTags();
 284      return div.childNodes[0] ? (div.childNodes.length > 1 ?
 285        $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
 286        div.childNodes[0].nodeValue) : '';
 287    },
 288  
 289    toQueryParams: function(separator) {
 290      var match = this.strip().match(/([^?#]*)(#.*)?$/);
 291      if (!match) return {};
 292  
 293      return match[1].split(separator || '&').inject({}, function(hash, pair) {
 294        if ((pair = pair.split('='))[0]) {
 295          var key = decodeURIComponent(pair.shift());
 296          var value = pair.length > 1 ? pair.join('=') : pair[0];
 297          if (value != undefined) value = decodeURIComponent(value);
 298  
 299          if (key in hash) {
 300            if (hash[key].constructor != Array) hash[key] = [hash[key]];
 301            hash[key].push(value);
 302          }
 303          else hash[key] = value;
 304        }
 305        return hash;
 306      });
 307    },
 308  
 309    toArray: function() {
 310      return this.split('');
 311    },
 312  
 313    succ: function() {
 314      return this.slice(0, this.length - 1) +
 315        String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
 316    },
 317  
 318    times: function(count) {
 319      var result = '';
 320      for (var i = 0; i < count; i++) result += this;
 321      return result;
 322    },
 323  
 324    camelize: function() {
 325      var parts = this.split('-'), len = parts.length;
 326      if (len == 1) return parts[0];
 327  
 328      var camelized = this.charAt(0) == '-'
 329        ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
 330        : parts[0];
 331  
 332      for (var i = 1; i < len; i++)
 333        camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
 334  
 335      return camelized;
 336    },
 337  
 338    capitalize: function() {
 339      return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
 340    },
 341  
 342    underscore: function() {
 343      return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
 344    },
 345  
 346    dasherize: function() {
 347      return this.gsub(/_/,'-');
 348    },
 349  
 350    inspect: function(useDoubleQuotes) {
 351      var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
 352        var character = String.specialChar[match[0]];
 353        return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
 354      });
 355      if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
 356      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
 357    },
 358  
 359    toJSON: function() {
 360      return this.inspect(true);
 361    },
 362  
 363    unfilterJSON: function(filter) {
 364      return this.sub(filter || Prototype.JSONFilter, '#{1}');
 365    },
 366  
 367    isJSON: function() {
 368      var str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
 369      return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
 370    },
 371  
 372    evalJSON: function(sanitize) {
 373      var json = this.unfilterJSON();
 374      try {
 375        if (!sanitize || json.isJSON()) return eval('(' + json + ')');
 376      } catch (e) { }
 377      throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
 378    },
 379  
 380    include: function(pattern) {
 381      return this.indexOf(pattern) > -1;
 382    },
 383  
 384    startsWith: function(pattern) {
 385      return this.indexOf(pattern) === 0;
 386    },
 387  
 388    endsWith: function(pattern) {
 389      var d = this.length - pattern.length;
 390      return d >= 0 && this.lastIndexOf(pattern) === d;
 391    },
 392  
 393    empty: function() {
 394      return this == '';
 395    },
 396  
 397    blank: function() {
 398      return /^\s*$/.test(this);
 399    }
 400  });
 401  
 402  if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
 403    escapeHTML: function() {
 404      return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 405    },
 406    unescapeHTML: function() {
 407      return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
 408    }
 409  });
 410  
 411  String.prototype.gsub.prepareReplacement = function(replacement) {
 412    if (typeof replacement == 'function') return replacement;
 413    var template = new Template(replacement);
 414    return function(match) { return template.evaluate(match) };
 415  }
 416  
 417  String.prototype.parseQuery = String.prototype.toQueryParams;
 418  
 419  Object.extend(String.prototype.escapeHTML, {
 420    div:  document.createElement('div'),
 421    text: document.createTextNode('')
 422  });
 423  
 424  with (String.prototype.escapeHTML) div.appendChild(text);
 425  
 426  var Template = Class.create();
 427  Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 428  Template.prototype = {
 429    initialize: function(template, pattern) {
 430      this.template = template.toString();
 431      this.pattern  = pattern || Template.Pattern;
 432    },
 433  
 434    evaluate: function(object) {
 435      return this.template.gsub(this.pattern, function(match) {
 436        var before = match[1];
 437        if (before == '\\') return match[2];
 438        return before + String.interpret(object[match[3]]);
 439      });
 440    }
 441  }
 442  
 443  var $break = {}, $continue = new Error('"throw $continue" is deprecated, use "return" instead');
 444  
 445  var Enumerable = {
 446    each: function(iterator) {
 447      var index = 0;
 448      try {
 449        this._each(function(value) {
 450          iterator(value, index++);
 451        });
 452      } catch (e) {
 453        if (e != $break) throw e;
 454      }
 455      return this;
 456    },
 457  
 458    eachSlice: function(number, iterator) {
 459      var index = -number, slices = [], array = this.toArray();
 460      while ((index += number) < array.length)
 461        slices.push(array.slice(index, index+number));
 462      return slices.map(iterator);
 463    },
 464  
 465    all: function(iterator) {
 466      var result = true;
 467      this.each(function(value, index) {
 468        result = result && !!(iterator || Prototype.K)(value, index);
 469        if (!result) throw $break;
 470      });
 471      return result;
 472    },
 473  
 474    any: function(iterator) {
 475      var result = false;
 476      this.each(function(value, index) {
 477        if (result = !!(iterator || Prototype.K)(value, index))
 478          throw $break;
 479      });
 480      return result;
 481    },
 482  
 483    collect: function(iterator) {
 484      var results = [];
 485      this.each(function(value, index) {
 486        results.push((iterator || Prototype.K)(value, index));
 487      });
 488      return results;
 489    },
 490  
 491    detect: function(iterator) {
 492      var result;
 493      this.each(function(value, index) {
 494        if (iterator(value, index)) {
 495          result = value;
 496          throw $break;
 497        }
 498      });
 499      return result;
 500    },
 501  
 502    findAll: function(iterator) {
 503      var results = [];
 504      this.each(function(value, index) {
 505        if (iterator(value, index))
 506          results.push(value);
 507      });
 508      return results;
 509    },
 510  
 511    grep: function(pattern, iterator) {
 512      var results = [];
 513      this.each(function(value, index) {
 514        var stringValue = value.toString();
 515        if (stringValue.match(pattern))
 516          results.push((iterator || Prototype.K)(value, index));
 517      })
 518      return results;
 519    },
 520  
 521    include: function(object) {
 522      var found = false;
 523      this.each(function(value) {
 524        if (value == object) {
 525          found = true;
 526          throw $break;
 527        }
 528      });
 529      return found;
 530    },
 531  
 532    inGroupsOf: function(number, fillWith) {
 533      fillWith = fillWith === undefined ? null : fillWith;
 534      return this.eachSlice(number, function(slice) {
 535        while(slice.length < number) slice.push(fillWith);
 536        return slice;
 537      });
 538    },
 539  
 540    inject: function(memo, iterator) {
 541      this.each(function(value, index) {
 542        memo = iterator(memo, value, index);
 543      });
 544      return memo;
 545    },
 546  
 547    invoke: function(method) {
 548      var args = $A(arguments).slice(1);
 549      return this.map(function(value) {
 550        return value[method].apply(value, args);
 551      });
 552    },
 553  
 554    max: function(iterator) {
 555      var result;
 556      this.each(function(value, index) {
 557        value = (iterator || Prototype.K)(value, index);
 558        if (result == undefined || value >= result)
 559          result = value;
 560      });
 561      return result;
 562    },
 563  
 564    min: function(iterator) {
 565      var result;
 566      this.each(function(value, index) {
 567        value = (iterator || Prototype.K)(value, index);
 568        if (result == undefined || value < result)
 569          result = value;
 570      });
 571      return result;
 572    },
 573  
 574    partition: function(iterator) {
 575      var trues = [], falses = [];
 576      this.each(function(value, index) {
 577        ((iterator || Prototype.K)(value, index) ?
 578          trues : falses).push(value);
 579      });
 580      return [trues, falses];
 581    },
 582  
 583    pluck: function(property) {
 584      var results = [];
 585      this.each(function(value, index) {
 586        results.push(value[property]);
 587      });
 588      return results;
 589    },
 590  
 591    reject: function(iterator) {
 592      var results = [];
 593      this.each(function(value, index) {
 594        if (!iterator(value, index))
 595          results.push(value);
 596      });
 597      return results;
 598    },
 599  
 600    sortBy: function(iterator) {
 601      return this.map(function(value, index) {
 602        return {value: value, criteria: iterator(value, index)};
 603      }).sort(function(left, right) {
 604        var a = left.criteria, b = right.criteria;
 605        return a < b ? -1 : a > b ? 1 : 0;
 606      }).pluck('value');
 607    },
 608  
 609    toArray: function() {
 610      return this.map();
 611    },
 612  
 613    zip: function() {
 614      var iterator = Prototype.K, args = $A(arguments);
 615      if (typeof args.last() == 'function')
 616        iterator = args.pop();
 617  
 618      var collections = [this].concat(args).map($A);
 619      return this.map(function(value, index) {
 620        return iterator(collections.pluck(index));
 621      });
 622    },
 623  
 624    size: function() {
 625      return this.toArray().length;
 626    },
 627  
 628    inspect: function() {
 629      return '#<Enumerable:' + this.toArray().inspect() + '>';
 630    }
 631  }
 632  
 633  Object.extend(Enumerable, {
 634    map:     Enumerable.collect,
 635    find:    Enumerable.detect,
 636    select:  Enumerable.findAll,
 637    member:  Enumerable.include,
 638    entries: Enumerable.toArray
 639  });
 640  var $A = Array.from = function(iterable) {
 641    if (!iterable) return [];
 642    if (iterable.toArray) {
 643      return iterable.toArray();
 644    } else {
 645      var results = [];
 646      for (var i = 0, length = iterable.length; i < length; i++)
 647        results.push(iterable[i]);
 648      return results;
 649    }
 650  }
 651  
 652  if (Prototype.Browser.WebKit) {
 653    $A = Array.from = function(iterable) {
 654      if (!iterable) return [];
 655      if (!(typeof iterable == 'function' && iterable == '[object NodeList]') &&
 656        iterable.toArray) {
 657        return iterable.toArray();
 658      } else {
 659        var results = [];
 660        for (var i = 0, length = iterable.length; i < length; i++)
 661          results.push(iterable[i]);
 662        return results;
 663      }
 664    }
 665  }
 666  
 667  Object.extend(Array.prototype, Enumerable);
 668  
 669  if (!Array.prototype._reverse)
 670    Array.prototype._reverse = Array.prototype.reverse;
 671  
 672  Object.extend(Array.prototype, {
 673    _each: function(iterator) {
 674      for (var i = 0, length = this.length; i < length; i++)
 675        iterator(this[i]);
 676    },
 677  
 678    clear: function() {
 679      this.length = 0;
 680      return this;
 681    },
 682  
 683    first: function() {
 684      return this[0];
 685    },
 686  
 687    last: function() {
 688      return this[this.length - 1];
 689    },
 690  
 691    compact: function() {
 692      return this.select(function(value) {
 693        return value != null;
 694      });
 695    },
 696  
 697    flatten: function() {
 698      return this.inject([], function(array, value) {
 699        return array.concat(value && value.constructor == Array ?
 700          value.flatten() : [value]);
 701      });
 702    },
 703  
 704    without: function() {
 705      var values = $A(arguments);
 706      return this.select(function(value) {
 707        return !values.include(value);
 708      });
 709    },
 710  
 711    indexOf: function(object) {
 712      for (var i = 0, length = this.length; i < length; i++)
 713        if (this[i] == object) return i;
 714      return -1;
 715    },
 716  
 717    reverse: function(inline) {
 718      return (inline !== false ? this : this.toArray())._reverse();
 719    },
 720  
 721    reduce: function() {
 722      return this.length > 1 ? this : this[0];
 723    },
 724  
 725    uniq: function(sorted) {
 726      return this.inject([], function(array, value, index) {
 727        if (0 == index || (sorted ? array.last() != value : !array.include(value)))
 728          array.push(value);
 729        return array;
 730      });
 731    },
 732  
 733    clone: function() {
 734      return [].concat(this);
 735    },
 736  
 737    size: function() {
 738      return this.length;
 739    },
 740  
 741    inspect: function() {
 742      return '[' + this.map(Object.inspect).join(', ') + ']';
 743    },
 744  
 745    toJSON: function() {
 746      var results = [];
 747      this.each(function(object) {
 748        var value = Object.toJSON(object);
 749        if (value !== undefined) results.push(value);
 750      });
 751      return '[' + results.join(', ') + ']';
 752    }
 753  });
 754  
 755  Array.prototype.toArray = Array.prototype.clone;
 756  
 757  function $w(string) {
 758    string = string.strip();
 759    return string ? string.split(/\s+/) : [];
 760  }
 761  
 762  if (Prototype.Browser.Opera){
 763    Array.prototype.concat = function() {
 764      var array = [];
 765      for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
 766      for (var i = 0, length = arguments.length; i < length; i++) {
 767        if (arguments[i].constructor == Array) {
 768          for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
 769            array.push(arguments[i][j]);
 770        } else {
 771          array.push(arguments[i]);
 772        }
 773      }
 774      return array;
 775    }
 776  }
 777  var Hash = function(object) {
 778    if (object instanceof Hash) this.merge(object);
 779    else Object.extend(this, object || {});
 780  };
 781  
 782  Object.extend(Hash, {
 783    toQueryString: function(obj) {
 784      var parts = [];
 785      parts.add = arguments.callee.addPair;
 786  
 787      this.prototype._each.call(obj, function(pair) {
 788        if (!pair.key) return;
 789        var value = pair.value;
 790  
 791        if (value && typeof value == 'object') {
 792          if (value.constructor == Array) value.each(function(value) {
 793            parts.add(pair.key, value);
 794          });
 795          return;
 796        }
 797        parts.add(pair.key, value);
 798      });
 799  
 800      return parts.join('&');
 801    },
 802  
 803    toJSON: function(object) {
 804      var results = [];
 805      this.prototype._each.call(object, function(pair) {
 806        var value = Object.toJSON(pair.value);
 807        if (value !== undefined) results.push(pair.key.toJSON() + ': ' + value);
 808      });
 809      return '{' + results.join(', ') + '}';
 810    }
 811  });
 812  
 813  Hash.toQueryString.addPair = function(key, value, prefix) {
 814    key = encodeURIComponent(key);
 815    if (value === undefined) this.push(key);
 816    else this.push(key + '=' + (value == null ? '' : encodeURIComponent(value)));
 817  }
 818  
 819  Object.extend(Hash.prototype, Enumerable);
 820  Object.extend(Hash.prototype, {
 821    _each: function(iterator) {
 822      for (var key in this) {
 823        var value = this[key];
 824        if (value && value == Hash.prototype[key]) continue;
 825  
 826        var pair = [key, value];
 827        pair.key = key;
 828        pair.value = value;
 829        iterator(pair);
 830      }
 831    },
 832  
 833    keys: function() {
 834      return this.pluck('key');
 835    },
 836  
 837    values: function() {
 838      return this.pluck('value');
 839    },
 840  
 841    merge: function(hash) {
 842      return $H(hash).inject(this, function(mergedHash, pair) {
 843        mergedHash[pair.key] = pair.value;
 844        return mergedHash;
 845      });
 846    },
 847  
 848    remove: function() {
 849      var result;
 850      for(var i = 0, length = arguments.length; i < length; i++) {
 851        var value = this[arguments[i]];
 852        if (value !== undefined){
 853          if (result === undefined) result = value;
 854          else {
 855            if (result.constructor != Array) result = [result];
 856            result.push(value)
 857          }
 858        }
 859        delete this[arguments[i]];
 860      }
 861      return result;
 862    },
 863  
 864    toQueryString: function() {
 865      return Hash.toQueryString(this);
 866    },
 867  
 868    inspect: function() {
 869      return '#<Hash:{' + this.map(function(pair) {
 870        return pair.map(Object.inspect).join(': ');
 871      }).join(', ') + '}>';
 872    },
 873  
 874    toJSON: function() {
 875      return Hash.toJSON(this);
 876    }
 877  });
 878  
 879  function $H(object) {
 880    if (object instanceof Hash) return object;
 881    return new Hash(object);
 882  };
 883  
 884  // Safari iterates over shadowed properties
 885  if (function() {
 886    var i = 0, Test = function(value) { this.key = value };
 887    Test.prototype.key = 'foo';
 888    for (var property in new Test('bar')) i++;
 889    return i > 1;
 890  }()) Hash.prototype._each = function(iterator) {
 891    var cache = [];
 892    for (var key in this) {
 893      var value = this[key];
 894      if ((value && value == Hash.prototype[key]) || cache.include(key)) continue;
 895      cache.push(key);
 896      var pair = [key, value];
 897      pair.key = key;
 898      pair.value = value;
 899      iterator(pair);
 900    }
 901  };
 902  ObjectRange = Class.create();
 903  Object.extend(ObjectRange.prototype, Enumerable);
 904  Object.extend(ObjectRange.prototype, {
 905    initialize: function(start, end, exclusive) {
 906      this.start = start;
 907      this.end = end;
 908      this.exclusive = exclusive;
 909    },
 910  
 911    _each: function(iterator) {
 912      var value = this.start;
 913      while (this.include(value)) {
 914        iterator(value);
 915        value = value.succ();
 916      }
 917    },
 918  
 919    include: function(value) {
 920      if (value < this.start)
 921        return false;
 922      if (this.exclusive)
 923        return value < this.end;
 924      return value <= this.end;
 925    }
 926  });
 927  
 928  var $R = function(start, end, exclusive) {
 929    return new ObjectRange(start, end, exclusive);
 930  }
 931  
 932  var Ajax = {
 933    getTransport: function() {
 934      return Try.these(
 935        function() {return new XMLHttpRequest()},
 936        function() {return new ActiveXObject('Msxml2.XMLHTTP')},
 937        function() {return new ActiveXObject('Microsoft.XMLHTTP')}
 938      ) || false;
 939    },
 940  
 941    activeRequestCount: 0
 942  }
 943  
 944  Ajax.Responders = {
 945    responders: [],
 946  
 947    _each: function(iterator) {
 948      this.responders._each(iterator);
 949    },
 950  
 951    register: function(responder) {
 952      if (!this.include(responder))
 953        this.responders.push(responder);
 954    },
 955  
 956    unregister: function(responder) {
 957      this.responders = this.responders.without(responder);
 958    },
 959  
 960    dispatch: function(callback, request, transport, json) {
 961      this.each(function(responder) {
 962        if (typeof responder[callback] == 'function') {
 963          try {
 964            responder[callback].apply(responder, [request, transport, json]);
 965          } catch (e) {}
 966        }
 967      });
 968    }
 969  };
 970  
 971  Object.extend(Ajax.Responders, Enumerable);
 972  
 973  Ajax.Responders.register({
 974    onCreate: function() {
 975      Ajax.activeRequestCount++;
 976    },
 977    onComplete: function() {
 978      Ajax.activeRequestCount--;
 979    }
 980  });
 981  
 982  Ajax.Base = function() {};
 983  Ajax.Base.prototype = {
 984    setOptions: function(options) {
 985      this.options = {
 986        method:       'post',
 987        asynchronous: true,
 988        contentType:  'application/x-www-form-urlencoded',
 989        encoding:     'UTF-8',
 990        parameters:   ''
 991      }
 992      Object.extend(this.options, options || {});
 993  
 994      this.options.method = this.options.method.toLowerCase();
 995      if (typeof this.options.parameters == 'string')
 996        this.options.parameters = this.options.parameters.toQueryParams();
 997    }
 998  }
 999  
1000  Ajax.Request = Class.create();
1001  Ajax.Request.Events =
1002    ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
1003  
1004  Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
1005    _complete: false,
1006  
1007    initialize: function(url, options) {
1008      this.transport = Ajax.getTransport();
1009      this.setOptions(options);
1010      this.request(url);
1011    },
1012  
1013    request: function(url) {
1014      this.url = url;
1015      this.method = this.options.method;
1016      var params = Object.clone(this.options.parameters);
1017  
1018      if (!['get', 'post'].include(this.method)) {
1019        // simulate other verbs over post
1020        params['_method'] = this.method;
1021        this.method = 'post';
1022      }
1023  
1024      this.parameters = params;
1025  
1026      if (params = Hash.toQueryString(params)) {
1027        // when GET, append parameters to URL
1028        if (this.method == 'get')
1029          this.url += (this.url.include('?') ? '&' : '?') + params;
1030        else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
1031          params += '&_=';
1032      }
1033  
1034      try {
1035        if (this.options.onCreate) this.options.onCreate(this.transport);
1036        Ajax.Responders.dispatch('onCreate', this, this.transport);
1037  
1038        this.transport.open(this.method.toUpperCase(), this.url,
1039          this.options.asynchronous);
1040  
1041        if (this.options.asynchronous)
1042          setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);
1043  
1044        this.transport.onreadystatechange = this.onStateChange.bind(this);
1045        this.setRequestHeaders();
1046  
1047        this.body = this.method == 'post' ? (this.options.postBody || params) : null;
1048        this.transport.send(this.body);
1049  
1050        /* Force Firefox to handle ready state 4 for synchronous requests */
1051        if (!this.options.asynchronous && this.transport.overrideMimeType)
1052          this.onStateChange();
1053  
1054      }
1055      catch (e) {
1056        this.dispatchException(e);
1057      }
1058    },
1059  
1060    onStateChange: function() {
1061      var readyState = this.transport.readyState;
1062      if (readyState > 1 && !((readyState == 4) && this._complete))
1063        this.respondToReadyState(this.transport.readyState);
1064    },
1065  
1066    setRequestHeaders: function() {
1067      var headers = {
1068        'X-Requested-With': 'XMLHttpRequest',
1069        'X-Prototype-Version': Prototype.Version,
1070        'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
1071      };
1072  
1073      if (this.method == 'post') {
1074        headers['Content-type'] = this.options.contentType +
1075          (this.options.encoding ? '; charset=' + this.options.encoding : '');
1076  
1077        /* Force "Connection: close" for older Mozilla browsers to work
1078         * around a bug where XMLHttpRequest sends an incorrect
1079         * Content-length header. See Mozilla Bugzilla #246651.
1080         */
1081        if (this.transport.overrideMimeType &&
1082            (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
1083              headers['Connection'] = 'close';
1084      }
1085  
1086      // user-defined headers
1087      if (typeof this.options.requestHeaders == 'object') {
1088        var extras = this.options.requestHeaders;
1089  
1090        if (typeof extras.push == 'function')
1091          for (var i = 0, length = extras.length; i < length; i += 2)
1092            headers[extras[i]] = extras[i+1];
1093        else
1094          $H(extras).each(function(pair) { headers[pair.key] = pair.value });
1095      }
1096  
1097      for (var name in headers)
1098        this.transport.setRequestHeader(name, headers[name]);
1099    },
1100  
1101    success: function() {
1102      return !this.transport.status
1103          || (this.transport.status >= 200 && this.transport.status < 300);
1104    },
1105  
1106    respondToReadyState: function(readyState) {
1107      var state = Ajax.Request.Events[readyState];
1108      var transport = this.transport, json = this.evalJSON();
1109  
1110      if (state == 'Complete') {
1111        try {
1112          this._complete = true;
1113          (this.options['on' + this.transport.status]
1114           || this.options['on' + (this.success() ? 'Success' : 'Failure')]
1115           || Prototype.emptyFunction)(transport, json);
1116        } catch (e) {
1117          this.dispatchException(e);
1118        }
1119  
1120        var contentType = this.getHeader('Content-type');
1121        if (contentType && contentType.strip().
1122          match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
1123            this.evalResponse();
1124      }
1125  
1126      try {
1127        (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
1128        Ajax.Responders.dispatch('on' + state, this, transport, json);
1129      } catch (e) {
1130        this.dispatchException(e);
1131      }
1132  
1133      if (state == 'Complete') {
1134        // avoid memory leak in MSIE: clean up
1135        this.transport.onreadystatechange = Prototype.emptyFunction;
1136      }
1137    },
1138  
1139    getHeader: function(name) {
1140      try {
1141        return this.transport.getResponseHeader(name);
1142      } catch (e) { return null }
1143    },
1144  
1145    evalJSON: function() {
1146      try {
1147        var json = this.getHeader('X-JSON');
1148        return json ? json.evalJSON() : null;
1149      } catch (e) { return null }
1150    },
1151  
1152    evalResponse: function() {
1153      try {
1154        return eval((this.transport.responseText || '').unfilterJSON());
1155      } catch (e) {
1156        this.dispatchException(e);
1157      }
1158    },
1159  
1160    dispatchException: function(exception) {
1161      (this.options.onException || Prototype.emptyFunction)(this, exception);
1162      Ajax.Responders.dispatch('onException', this, exception);
1163    }
1164  });
1165  
1166  Ajax.Updater = Class.create();
1167  
1168  Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
1169    initialize: function(container, url, options) {
1170      this.container = {
1171        success: (container.success || container),
1172        failure: (container.failure || (container.success ? null : container))
1173      }
1174  
1175      this.transport = Ajax.getTransport();
1176      this.setOptions(options);
1177  
1178      var onComplete = this.options.onComplete || Prototype.emptyFunction;
1179      this.options.onComplete = (function(transport, param) {
1180        this.updateContent();
1181        onComplete(transport, param);
1182      }).bind(this);
1183  
1184      this.request(url);
1185    },
1186  
1187    updateContent: function() {
1188      var receiver = this.container[this.success() ? 'success' : 'failure'];
1189      var response = this.transport.responseText;
1190  
1191      if (!this.options.evalScripts) response = response.stripScripts();
1192  
1193      if (receiver = $(receiver)) {
1194        if (this.options.insertion)
1195          new this.options.insertion(receiver, response);
1196        else
1197          receiver.update(response);
1198      }
1199  
1200      if (this.success()) {
1201        if (this.onComplete)
1202          setTimeout(this.onComplete.bind(this), 10);
1203      }
1204    }
1205  });
1206  
1207  Ajax.PeriodicalUpdater = Class.create();
1208  Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
1209    initialize: function(container, url, options) {
1210      this.setOptions(options);
1211      this.onComplete = this.options.onComplete;
1212  
1213      this.frequency = (this.options.frequency || 2);
1214      this.decay = (this.options.decay || 1);
1215  
1216      this.updater = {};
1217      this.container = container;
1218      this.url = url;
1219  
1220      this.start();
1221    },
1222  
1223    start: function() {
1224      this.options.onComplete = this.updateComplete.bind(this);
1225      this.onTimerEvent();
1226    },
1227  
1228    stop: function() {
1229      this.updater.options.onComplete = undefined;
1230      clearTimeout(this.timer);
1231      (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
1232    },
1233  
1234    updateComplete: function(request) {
1235      if (this.options.decay) {
1236        this.decay = (request.responseText == this.lastText ?
1237          this.decay * this.options.decay : 1);
1238  
1239        this.lastText = request.responseText;
1240      }
1241      this.timer = setTimeout(this.onTimerEvent.bind(this),
1242        this.decay * this.frequency * 1000);
1243    },
1244  
1245    onTimerEvent: function() {
1246      this.updater = new Ajax.Updater(this.container, this.url, this.options);
1247    }
1248  });
1249  function $(element) {
1250    if (arguments.length > 1) {
1251      for (var i = 0, elements = [], length = arguments.length; i < length; i++)
1252        elements.push($(arguments[i]));
1253      return elements;
1254    }
1255    if (typeof element == 'string')
1256      element = document.getElementById(element);
1257    return Element.extend(element);
1258  }
1259  
1260  if (Prototype.BrowserFeatures.XPath) {
1261    document._getElementsByXPath = function(expression, parentElement) {
1262      var results = [];
1263      var query = document.evaluate(expression, $(parentElement) || document,
1264        null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
1265      for (var i = 0, length = query.snapshotLength; i < length; i++)
1266        results.push(query.snapshotItem(i));
1267      return results;
1268    };
1269  
1270    document.getElementsByClassName = function(className, parentElement) {
1271      var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
1272      return document._getElementsByXPath(q, parentElement);
1273    }
1274  
1275  } else document.getElementsByClassName = function(className, parentElement) {
1276    var children = ($(parentElement) || document.body).getElementsByTagName('*');
1277    var elements = [], child, pattern = new RegExp("(^|\\s)" + className + "(\\s|$)");
1278    for (var i = 0, length = children.length; i < length; i++) {
1279      child = children[i];
1280      var elementClassName = child.className;
1281      if (elementClassName.length == 0) continue;
1282      if (elementClassName == className || elementClassName.match(pattern))
1283        elements.push(Element.extend(child));
1284    }
1285    return elements;
1286  };
1287  
1288  /*--------------------------------------------------------------------------*/
1289  
1290  if (!window.Element) var Element = {};
1291  
1292  Element.extend = function(element) {
1293    var F = Prototype.BrowserFeatures;
1294    if (!element || !element.tagName || element.nodeType == 3 ||
1295     element._extended || F.SpecificElementExtensions || element == window)
1296      return element;
1297  
1298    var methods = {}, tagName = element.tagName, cache = Element.extend.cache,
1299     T = Element.Methods.ByTag;
1300  
1301    // extend methods for all tags (Safari doesn't need this)
1302    if (!F.ElementExtensions) {
1303      Object.extend(methods, Element.Methods),
1304      Object.extend(methods, Element.Methods.Simulated);
1305    }
1306  
1307    // extend methods for specific tags
1308    if (T[tagName]) Object.extend(methods, T[tagName]);
1309  
1310    for (var property in methods) {
1311      var value = methods[property];
1312      if (typeof value == 'function' && !(property in element))
1313        element[property] = cache.findOrStore(value);
1314    }
1315  
1316    element._extended = Prototype.emptyFunction;
1317    return element;
1318  };
1319  
1320  Element.extend.cache = {
1321    findOrStore: function(value) {
1322      return this[value] = this[value] || function() {
1323        return value.apply(null, [this].concat($A(arguments)));
1324      }
1325    }
1326  };
1327  
1328  Element.Methods = {
1329    visible: function(element) {
1330      return $(element).style.display != 'none';
1331    },
1332  
1333    toggle: function(element) {
1334      element = $(element);
1335      Element[Element.visible(element) ? 'hide' : 'show'](element);
1336      return element;
1337    },
1338  
1339    hide: function(element) {
1340      $(element).style.display = 'none';
1341      return element;
1342    },
1343  
1344    show: function(element) {
1345      $(element).style.display = '';
1346      return element;
1347    },
1348  
1349    remove: function(element) {
1350      element = $(element);
1351      element.parentNode.removeChild(element);
1352      return element;
1353    },
1354  
1355    update: function(element, html) {
1356      html = typeof html == 'undefined' ? '' : html.toString();
1357      $(element).innerHTML = html.stripScripts();
1358      setTimeout(function() {html.evalScripts()}, 10);
1359      return element;
1360    },
1361  
1362    replace: function(element, html) {
1363      element = $(element);
1364      html = typeof html == 'undefined' ? '' : html.toString();
1365      if (element.outerHTML) {
1366        element.outerHTML = html.stripScripts();
1367      } else {
1368        var range = element.ownerDocument.createRange();
1369        range.selectNodeContents(element);
1370        element.parentNode.replaceChild(
1371          range.createContextualFragment(html.stripScripts()), element);
1372      }
1373      setTimeout(function() {html.evalScripts()}, 10);
1374      return element;
1375    },
1376  
1377    inspect: function(element) {
1378      element = $(element);
1379      var result = '<' + element.tagName.toLowerCase();
1380      $H({'id': 'id', 'className': 'class'}).each(function(pair) {
1381        var property = pair.first(), attribute = pair.last();
1382        var value = (element[property] || '').toString();
1383        if (value) result += ' ' + attribute + '=' + value.inspect(true);
1384      });
1385      return result + '>';
1386    },
1387  
1388    recursivelyCollect: function(element, property) {
1389      element = $(element);
1390      var elements = [];
1391      while (element = element[property])
1392        if (element.nodeType == 1)
1393          elements.push(Element.extend(element));
1394      return elements;
1395    },
1396  
1397    ancestors: function(element) {
1398      return $(element).recursivelyCollect('parentNode');
1399    },
1400  
1401    descendants: function(element) {
1402      return $A($(element).getElementsByTagName('*')).each(Element.extend);
1403    },
1404  
1405    firstDescendant: function(element) {
1406      element = $(element).firstChild;
1407      while (element && element.nodeType != 1) element = element.nextSibling;
1408      return $(element);
1409    },
1410  
1411    immediateDescendants: function(element) {
1412      if (!(element = $(element).firstChild)) return [];
1413      while (element && element.nodeType != 1) element = element.nextSibling;
1414      if (element) return [element].concat($(element).nextSiblings());
1415      return [];
1416    },
1417  
1418    previousSiblings: function(element) {
1419      return $(element).recursivelyCollect('previousSibling');
1420    },
1421  
1422    nextSiblings: function(element) {
1423      return $(element).recursivelyCollect('nextSibling');
1424    },
1425  
1426    siblings: function(element) {
1427      element = $(element);
1428      return element.previousSiblings().reverse().concat(element.nextSiblings());
1429    },
1430  
1431    match: function(element, selector) {
1432      if (typeof selector == 'string')
1433        selector = new Selector(selector);
1434      return selector.match($(element));
1435    },
1436  
1437    up: function(element, expression, index) {
1438      element = $(element);
1439      if (arguments.length == 1) return $(element.parentNode);
1440      var ancestors = element.ancestors();
1441      return expression ? Selector.findElement(ancestors, expression, index) :
1442        ancestors[index || 0];
1443    },
1444  
1445    down: function(element, expression, index) {
1446      element = $(element);
1447      if (arguments.length == 1) return element.firstDescendant();
1448      var descendants = element.descendants();
1449      return expression ? Selector.findElement(descendants, expression, index) :
1450        descendants[index || 0];
1451    },
1452  
1453    previous: function(element, expression, index) {
1454      element = $(element);
1455      if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
1456      var previousSiblings = element.previousSiblings();
1457      return expression ? Selector.findElement(previousSiblings, expression, index) :
1458        previousSiblings[index || 0];
1459    },
1460  
1461    next: function(element, expression, index) {
1462      element = $(element);
1463      if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
1464      var nextSiblings = element.nextSiblings();
1465      return expression ? Selector.findElement(nextSiblings, expression, index) :
1466        nextSiblings[index || 0];
1467    },
1468  
1469    getElementsBySelector: function() {
1470      var args = $A(arguments), element = $(args.shift());
1471      return Selector.findChildElements(element, args);
1472    },
1473  
1474    getElementsByClassName: function(element, className) {
1475      return document.getElementsByClassName(className, element);
1476    },
1477  
1478    readAttribute: function(element, name) {
1479      element = $(element);
1480      if (Prototype.Browser.IE) {
1481        if (!element.attributes) return null;
1482        var t = Element._attributeTranslations;
1483        if (t.values[name]) return t.values[name](element, name);
1484        if (t.names[name])  name = t.names[name];
1485        var attribute = element.attributes[name];
1486        return attribute ? attribute.nodeValue : null;
1487      }
1488      return element.getAttribute(name);
1489    },
1490  
1491    getHeight: function(element) {
1492      return $(element).getDimensions().height;
1493    },
1494  
1495    getWidth: function(element) {
1496      return $(element).getDimensions().width;
1497    },
1498  
1499    classNames: function(element) {
1500      return new Element.ClassNames(element);
1501    },
1502  
1503    hasClassName: function(element, className) {
1504      if (!(element = $(element))) return;
1505      var elementClassName = element.className;
1506      if (elementClassName.length == 0) return false;
1507      if (elementClassName == className ||
1508          elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
1509        return true;
1510      return false;
1511    },
1512  
1513    addClassName: function(element, className) {
1514      if (!(element = $(element))) return;
1515      Element.classNames(element).add(className);
1516      return element;
1517    },
1518  
1519    removeClassName: function(element, className) {
1520      if (!(element = $(element))) return;
1521      Element.classNames(element).remove(className);
1522      return element;
1523    },
1524  
1525    toggleClassName: function(element, className) {
1526      if (!(element = $(element))) return;
1527      Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
1528      return element;
1529    },
1530  
1531    observe: function() {
1532      Event.observe.apply(Event, arguments);
1533      return $A(arguments).first();
1534    },
1535  
1536    stopObserving: function() {
1537      Event.stopObserving.apply(Event, arguments);
1538      return $A(arguments).first();
1539    },
1540  
1541    // removes whitespace-only text node children
1542    cleanWhitespace: function(element) {
1543      element = $(element);
1544      var node = element.firstChild;
1545      while (node) {
1546        var nextNode = node.nextSibling;
1547        if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
1548          element.removeChild(node);
1549        node = nextNode;
1550      }
1551      return element;
1552    },
1553  
1554    empty: function(element) {
1555      return $(element).innerHTML.blank();
1556    },
1557  
1558    descendantOf: function(element, ancestor) {
1559      element = $(element), ancestor = $(ancestor);
1560      while (element = element.parentNode)
1561        if (element == ancestor) return true;
1562      return false;
1563    },
1564  
1565    scrollTo: function(element) {
1566      element = $(element);
1567      var pos = Position.cumulativeOffset(element);
1568      window.scrollTo(pos[0], pos[1]);
1569      return element;
1570    },
1571  
1572    getStyle: function(element, style) {
1573      element = $(element);
1574      style = style == 'float' ? 'cssFloat' : style.camelize();
1575      var value = element.style[style];
1576      if (!value) {
1577        var css = document.defaultView.getComputedStyle(element, null);
1578        value = css ? css[style] : null;
1579      }
1580      if (style == 'opacity') return value ? parseFloat(value) : 1.0;
1581      return value == 'auto' ? null : value;
1582    },
1583  
1584    getOpacity: function(element) {
1585      return $(element).getStyle('opacity');
1586    },
1587  
1588    setStyle: function(element, styles, camelized) {
1589      element = $(element);
1590      var elementStyle = element.style;
1591  
1592      for (var property in styles)
1593        if (property == 'opacity') element.setOpacity(styles[property])
1594        else
1595          elementStyle[(property == 'float' || property == 'cssFloat') ?
1596            (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') :
1597            (camelized ? property : property.camelize())] = styles[property];
1598  
1599      return element;
1600    },
1601  
1602    setOpacity: function(element, value) {
1603      element = $(element);
1604      element.style.opacity = (value == 1 || value === '') ? '' :
1605        (value < 0.00001) ? 0 : value;
1606      return element;
1607    },
1608  
1609    getDimensions: function(element) {
1610      element = $(element);
1611      var display = $(element).getStyle('display');
1612      if (display != 'none' && display != null) // Safari bug
1613        return {width: element.offsetWidth, height: element.offsetHeight};
1614  
1615      // All *Width and *Height properties give 0 on elements with display none,
1616      // so enable the element temporarily
1617      var els = element.style;
1618      var originalVisibility = els.visibility;
1619      var originalPosition = els.position;
1620      var originalDisplay = els.display;
1621      els.visibility = 'hidden';
1622      els.position = 'absolute';
1623      els.display = 'block';
1624      var originalWidth = element.clientWidth;
1625      var originalHeight = element.clientHeight;
1626      els.display = originalDisplay;
1627      els.position = originalPosition;
1628      els.visibility = originalVisibility;
1629      return {width: originalWidth, height: originalHeight};
1630    },
1631  
1632    makePositioned: function(element) {
1633      element = $(element);
1634      var pos = Element.getStyle(element, 'position');
1635      if (pos == 'static' || !pos) {
1636        element._madePositioned = true;
1637        element.style.position = 'relative';
1638        // Opera returns the offset relative to the positioning context, when an
1639        // element is position relative but top and left have not been defined
1640        if (window.opera) {
1641          element.style.top = 0;
1642          element.style.left = 0;
1643        }
1644      }
1645      return element;
1646    },
1647  
1648    undoPositioned: function(element) {
1649      element = $(element);
1650      if (element._madePositioned) {
1651        element._madePositioned = undefined;
1652        element.style.position =
1653          element.style.top =
1654          element.style.left =
1655          element.style.bottom =
1656          element.style.right = '';
1657      }
1658      return element;
1659    },
1660  
1661    makeClipping: function(element) {
1662      element = $(element);
1663      if (element._overflow) return element;
1664      element._overflow = element.style.overflow || 'auto';
1665      if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
1666        element.style.overflow = 'hidden';
1667      return element;
1668    },
1669  
1670    undoClipping: function(element) {
1671      element = $(element);
1672      if (!element._overflow) return element;
1673      element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
1674      element._overflow = null;
1675      return element;
1676    }
1677  };
1678  
1679  Object.extend(Element.Methods, {
1680    childOf: Element.Methods.descendantOf,
1681    childElements: Element.Methods.immediateDescendants
1682  });
1683  
1684  if (Prototype.Browser.Opera) {
1685    Element.Methods._getStyle = Element.Methods.getStyle;
1686    Element.Methods.getStyle = function(element, style) {
1687      switch(style) {
1688        case 'left':
1689        case 'top':
1690        case 'right':
1691        case 'bottom':
1692          if (Element._getStyle(element, 'position') == 'static') return null;
1693        default: return Element._getStyle(element, style);
1694      }
1695    };
1696  }
1697  else if (Prototype.Browser.IE) {
1698    Element.Methods.getStyle = function(element, style) {
1699      element = $(element);
1700      style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
1701      var value = element.style[style];
1702      if (!value && element.currentStyle) value = element.currentStyle[style];
1703  
1704      if (style == 'opacity') {
1705        if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
1706          if (value[1]) return parseFloat(value[1]) / 100;
1707        return 1.0;
1708      }
1709  
1710      if (value == 'auto') {
1711        if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
1712          return element['offset'+style.capitalize()] + 'px';
1713        return null;
1714      }
1715      return value;
1716    };
1717  
1718    Element.Methods.setOpacity = function(element, value) {
1719      element = $(element);
1720      var filter = element.getStyle('filter'), style = element.style;
1721      if (value == 1 || value === '') {
1722        style.filter = filter.replace(/alpha\([^\)]*\)/gi,'');
1723        return element;
1724      } else if (value < 0.00001) value = 0;
1725      style.filter = filter.replace(/alpha\([^\)]*\)/gi, '') +
1726        'alpha(opacity=' + (value * 100) + ')';
1727      return element;
1728    };
1729  
1730    // IE is missing .innerHTML support for TABLE-related elements
1731    Element.Methods.update = function(element, html) {
1732      element = $(element);
1733      html = typeof html == 'undefined' ? '' : html.toString();
1734      var tagName = element.tagName.toUpperCase();
1735      if (['THEAD','TBODY','TR','TD'].include(tagName)) {
1736        var div = document.createElement('div');
1737        switch (tagName) {
1738          case 'THEAD':
1739          case 'TBODY':
1740            div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
1741            depth = 2;
1742            break;
1743          case 'TR':
1744            div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
1745            depth = 3;
1746            break;
1747          case 'TD':
1748            div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
1749            depth = 4;
1750        }
1751        $A(element.childNodes).each(function(node) { element.removeChild(node) });
1752        depth.times(function() { div = div.firstChild });
1753        $A(div.childNodes).each(function(node) { element.appendChild(node) });
1754      } else {
1755        element.innerHTML = html.stripScripts();
1756      }
1757      setTimeout(function() { html.evalScripts() }, 10);
1758      return element;
1759    }
1760  }
1761  else if (Prototype.Browser.Gecko) {
1762    Element.Methods.setOpacity = function(element, value) {
1763      element = $(element);
1764      element.style.opacity = (value == 1) ? 0.999999 :
1765        (value === '') ? '' : (value < 0.00001) ? 0 : value;
1766      return element;
1767    };
1768  }
1769  
1770  Element._attributeTranslations = {
1771    names: {
1772      colspan:   "colSpan",
1773      rowspan:   "rowSpan",
1774      valign:    "vAlign",
1775      datetime:  "dateTime",
1776      accesskey: "accessKey",
1777      tabindex:  "tabIndex",
1778      enctype:   "encType",
1779      maxlength: "maxLength",
1780      readonly:  "readOnly",
1781      longdesc:  "longDesc"
1782    },
1783    values: {
1784      _getAttr: function(element, attribute) {
1785        return element.getAttribute(attribute, 2);
1786      },
1787      _flag: function(element, attribute) {
1788        return $(element).hasAttribute(attribute) ? attribute : null;
1789      },
1790      style: function(element) {
1791        return element.style.cssText.toLowerCase();
1792      },
1793      title: function(element) {
1794        var node = element.getAttributeNode('title');
1795        return node.specified ? node.nodeValue : null;
1796      }
1797    }
1798  };
1799  
1800  (function() {
1801    Object.extend(this, {
1802      href: this._getAttr,
1803      src:  this._getAttr,
1804      type: this._getAttr,
1805      disabled: this._flag,
1806      checked:  this._flag,
1807      readonly: this._flag,
1808      multiple: this._flag
1809    });
1810  }).call(Element._attributeTranslations.values);
1811  
1812  Element.Methods.Simulated = {
1813    hasAttribute: function(element, attribute) {
1814      var t = Element._attributeTranslations, node;
1815      attribute = t.names[attribute] || attribute;
1816      node = $(element).getAttributeNode(attribute);
1817      return node && node.specified;
1818    }
1819  };
1820  
1821  Element.Methods.ByTag = {};
1822  
1823  Object.extend(Element, Element.Methods);
1824  
1825  if (!Prototype.BrowserFeatures.ElementExtensions &&
1826   document.createElement('div').__proto__) {
1827    window.HTMLElement = {};
1828    window.HTMLElement.prototype = document.createElement('div').__proto__;
1829    Prototype.BrowserFeatures.ElementExtensions = true;
1830  }
1831  
1832  Element.hasAttribute = function(element, attribute) {
1833    if (element.hasAttribute) return element.hasAttribute(attribute);
1834    return Element.Methods.Simulated.hasAttribute(element, attribute);
1835  };
1836  
1837  Element.addMethods = function(methods) {
1838    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
1839  
1840    if (!methods) {
1841      Object.extend(Form, Form.Methods);
1842      Object.extend(Form.Element, Form.Element.Methods);
1843      Object.extend(Element.Methods.ByTag, {
1844        "FORM":     Object.clone(Form.Methods),
1845        "INPUT":    Object.clone(Form.Element.Methods),
1846        "SELECT":   Object.clone(Form.Element.Methods),
1847        "TEXTAREA": Object.clone(Form.Element.Methods)
1848      });
1849    }
1850  
1851    if (arguments.length == 2) {
1852      var tagName = methods;
1853      methods = arguments[1];
1854    }
1855  
1856    if (!tagName) Object.extend(Element.Methods, methods || {});
1857    else {
1858      if (tagName.constructor == Array) tagName.each(extend);
1859      else extend(tagName);
1860    }
1861  
1862    function extend(tagName) {
1863      tagName = tagName.toUpperCase();
1864      if (!Element.Methods.ByTag[tagName])
1865        Element.Methods.ByTag[tagName] = {};
1866      Object.extend(Element.Methods.ByTag[tagName], methods);
1867    }
1868  
1869    function copy(methods, destination, onlyIfAbsent) {
1870      onlyIfAbsent = onlyIfAbsent || false;
1871      var cache = Element.extend.cache;
1872      for (var property in methods) {
1873        var value = methods[property];
1874        if (!onlyIfAbsent || !(property in destination))
1875          destination[property] = cache.findOrStore(value);
1876      }
1877    }
1878  
1879    function findDOMClass(tagName) {
1880      var klass;
1881      var trans = {
1882        "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
1883        "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
1884        "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
1885        "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
1886        "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
1887        "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
1888        "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
1889        "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
1890        "FrameSet", "IFRAME": "IFrame"
1891      };
1892      if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
1893      if (window[klass]) return window[klass];
1894      klass = 'HTML' + tagName + 'Element';
1895      if (window[klass]) return window[klass];
1896      klass = 'HTML' + tagName.capitalize() + 'Element';
1897      if (window[klass]) return window[klass];
1898  
1899      window[klass] = {};
1900      window[klass].prototype = document.createElement(tagName).__proto__;
1901      return window[klass];
1902    }
1903  
1904    if (F.ElementExtensions) {
1905      copy(Element.Methods, HTMLElement.prototype);
1906      copy(Element.Methods.Simulated, HTMLElement.prototype, true);
1907    }
1908  
1909    if (F.SpecificElementExtensions) {
1910      for (var tag in Element.Methods.ByTag) {
1911        var klass = findDOMClass(tag);
1912        if (typeof klass == "undefined") continue;
1913        copy(T[tag], klass.prototype);
1914      }
1915    }
1916  
1917    Object.extend(Element, Element.Methods);
1918    delete Element.ByTag;
1919  };
1920  
1921  var Toggle = { display: Element.toggle };
1922  
1923  /*--------------------------------------------------------------------------*/
1924  
1925  Abstract.Insertion = function(adjacency) {
1926    this.adjacency = adjacency;
1927  }
1928  
1929  Abstract.Insertion.prototype = {
1930    initialize: function(element, content) {
1931      this.element = $(element);
1932      this.content = content.stripScripts();
1933  
1934      if (this.adjacency && this.element.insertAdjacentHTML) {
1935        try {
1936          this.element.insertAdjacentHTML(this.adjacency, this.content);
1937        } catch (e) {
1938          var tagName = this.element.tagName.toUpperCase();
1939          if (['TBODY', 'TR'].include(tagName)) {
1940            this.insertContent(this.contentFromAnonymousTable());
1941          } else {
1942            throw e;
1943          }
1944        }
1945      } else {
1946        this.range = this.element.ownerDocument.createRange();
1947        if (this.initializeRange) this.initializeRange();
1948        this.insertContent([this.range.createContextualFragment(this.content)]);
1949      }
1950  
1951      setTimeout(function() {content.evalScripts()}, 10);
1952    },
1953  
1954    contentFromAnonymousTable: function() {
1955      var div = document.createElement('div');
1956      div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
1957      return $A(div.childNodes[0].childNodes[0].childNodes);
1958    }
1959  }
1960  
1961  var Insertion = new Object();
1962  
1963  Insertion.Before = Class.create();
1964  Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
1965    initializeRange: function() {
1966      this.range.setStartBefore(this.element);
1967    },
1968  
1969    insertContent: function(fragments) {
1970      fragments.each((function(fragment) {
1971        this.element.parentNode.insertBefore(fragment, this.element);
1972      }).bind(this));
1973    }
1974  });
1975  
1976  Insertion.Top = Class.create();
1977  Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
1978    initializeRange: function() {
1979      this.range.selectNodeContents(this.element);
1980      this.range.collapse(true);
1981    },
1982  
1983    insertContent: function(fragments) {
1984      fragments.reverse(false).each((function(fragment) {
1985        this.element.insertBefore(fragment, this.element.firstChild);
1986      }).bind(this));
1987    }
1988  });
1989  
1990  Insertion.Bottom = Class.create();
1991  Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
1992    initializeRange: function() {
1993      this.range.selectNodeContents(this.element);
1994      this.range.collapse(this.element);
1995    },
1996  
1997    insertContent: function(fragments) {
1998      fragments.each((function(fragment) {
1999        this.element.appendChild(fragment);
2000      }).bind(this));
2001    }
2002  });
2003  
2004  Insertion.After = Class.create();
2005  Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
2006    initializeRange: function() {
2007      this.range.setStartAfter(this.element);
2008    },
2009  
2010    insertContent: function(fragments) {
2011      fragments.each((function(fragment) {
2012        this.element.parentNode.insertBefore(fragment,
2013          this.element.nextSibling);
2014      }).bind(this));
2015    }
2016  });
2017  
2018  /*--------------------------------------------------------------------------*/
2019  
2020  Element.ClassNames = Class.create();
2021  Element.ClassNames.prototype = {
2022    initialize: function(element) {
2023      this.element = $(element);
2024    },
2025  
2026    _each: function(iterator) {
2027      this.element.className.split(/\s+/).select(function(name) {
2028        return name.length > 0;
2029      })._each(iterator);
2030    },
2031  
2032    set: function(className) {
2033      this.element.className = className;
2034    },
2035  
2036    add: function(classNameToAdd) {
2037      if (this.include(classNameToAdd)) return;
2038      this.set($A(this).concat(classNameToAdd).join(' '));
2039    },
2040  
2041    remove: function(classNameToRemove) {
2042      if (!this.include(classNameToRemove)) return;
2043      this.set($A(this).without(classNameToRemove).join(' '));
2044    },
2045  
2046    toString: function() {
2047      return $A(this).join(' ');
2048    }
2049  };
2050  
2051  Object.extend(Element.ClassNames.prototype, Enumerable);
2052  /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
2053   * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
2054   * license.  Please see http://www.yui-ext.com/ for more information. */
2055  
2056  var Selector = Class.create();
2057  
2058  Selector.prototype = {
2059    initialize: function(expression) {
2060      this.expression = expression.strip();
2061      this.compileMatcher();
2062    },
2063  
2064    compileMatcher: function() {
2065      // Selectors with namespaced attributes can't use the XPath version
2066      if (Prototype.BrowserFeatures.XPath && !(/\[[\w-]*?:/).test(this.expression))
2067        return this.compileXPathMatcher();
2068  
2069      var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
2070          c = Selector.criteria, le, p, m;
2071  
2072      if (Selector._cache[e]) {
2073        this.matcher = Selector._cache[e]; return;
2074      }
2075      this.matcher = ["this.matcher = function(root) {",
2076                      "var r = root, h = Selector.handlers, c = false, n;"];
2077  
2078      while (e && le != e && (/\S/).test(e)) {
2079        le = e;
2080        for (var i in ps) {
2081          p = ps[i];
2082          if (m = e.match(p)) {
2083            this.matcher.push(typeof c[i] == 'function' ? c[i](m) :
2084                new Template(c[i]).evaluate(m));
2085            e = e.replace(m[0], '');
2086            break;
2087          }
2088        }
2089      }
2090  
2091      this.matcher.push("return h.unique(n);\n}");
2092      eval(this.matcher.join('\n'));
2093      Selector._cache[this.expression] = this.matcher;
2094    },
2095  
2096    compileXPathMatcher: function() {
2097      var e = this.expression, ps = Selector.patterns,
2098          x = Selector.xpath, le,  m;
2099  
2100      if (Selector._cache[e]) {
2101        this.xpath = Selector._cache[e]; return;
2102      }
2103  
2104      this.matcher = ['.//*'];
2105      while (e && le != e && (/\S/).test(e)) {
2106        le = e;
2107        for (var i in ps) {
2108          if (m = e.match(ps[i])) {
2109            this.matcher.push(typeof x[i] == 'function' ? x[i](m) :
2110              new Template(x[i]).evaluate(m));
2111            e = e.replace(m[0], '');
2112            break;
2113          }
2114        }
2115      }
2116  
2117      this.xpath = this.matcher.join('');
2118      Selector._cache[this.expression] = this.xpath;
2119    },
2120  
2121    findElements: function(root) {
2122      root = root || document;
2123      if (this.xpath) return document._getElementsByXPath(this.xpath, root);
2124      return this.matcher(root);
2125    },
2126  
2127    match: function(element) {
2128      return this.findElements(document).include(element);
2129    },
2130  
2131    toString: function() {
2132      return this.expression;
2133    },
2134  
2135    inspect: function() {
2136      return "#<Selector:" + this.expression.inspect() + ">";
2137    }
2138  };
2139  
2140  Object.extend(Selector, {
2141    _cache: {},
2142  
2143    xpath: {
2144      descendant:   "//*",
2145      child:        "/*",
2146      adjacent:     "/following-sibling::*[1]",
2147      laterSibling: '/following-sibling::*',
2148      tagName:      function(m) {
2149        if (m[1] == '*') return '';
2150        return "[local-name()='" + m[1].toLowerCase() +
2151               "' or local-name()='" + m[1].toUpperCase() + "']";
2152      },
2153      className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
2154      id:           "[@id='#{1}']",
2155      attrPresence: "[@#{1}]",
2156      attr: function(m) {
2157        m[3] = m[5] || m[6];
2158        return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
2159      },
2160      pseudo: function(m) {
2161        var h = Selector.xpath.pseudos[m[1]];
2162        if (!h) return '';
2163        if (typeof h === 'function') return h(m);
2164        return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
2165      },
2166      operators: {
2167        '=':  "[@#{1}='#{3}']",
2168        '!=': "[@#{1}!='#{3}']",
2169        '^=': "[starts-with(@#{1}, '#{3}')]",
2170        '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
2171        '*=': "[contains(@#{1}, '#{3}')]",
2172        '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
2173        '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
2174      },
2175      pseudos: {
2176        'first-child': '[not(preceding-sibling::*)]',
2177        'last-child':  '[not(following-sibling::*)]',
2178        'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
2179        'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
2180        'checked':     "[@checked]",
2181        'disabled':    "[@disabled]",
2182        'enabled':     "[not(@disabled)]",
2183        'not': function(m) {
2184          var e = m[6], p = Selector.patterns,
2185              x = Selector.xpath, le, m, v;
2186  
2187          var exclusion = [];
2188          while (e && le != e && (/\S/).test(e)) {
2189            le = e;
2190            for (var i in p) {
2191              if (m = e.match(p[i])) {
2192                v = typeof x[i] == 'function' ? x[i](m) : new Template(x[i]).evaluate(m);
2193                exclusion.push("(" + v.substring(1, v.length - 1) + ")");
2194                e = e.replace(m[0], '');
2195                break;
2196              }
2197            }
2198          }
2199          return "[not(" + exclusion.join(" and ") + ")]";
2200        },
2201        'nth-child':      function(m) {
2202          return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
2203        },
2204        'nth-last-child': function(m) {
2205          return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
2206        },
2207        'nth-of-type':    function(m) {
2208          return Selector.xpath.pseudos.nth("position() ", m);
2209        },
2210        'nth-last-of-type': function(m) {
2211          return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
2212        },
2213        'first-of-type':  function(m) {
2214          m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
2215        },
2216        'last-of-type':   function(m) {
2217          m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
2218        },
2219        'only-of-type':   function(m) {
2220          var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
2221        },
2222        nth: function(fragment, m) {
2223          var mm, formula = m[6], predicate;
2224          if (formula == 'even') formula = '2n+0';
2225          if (formula == 'odd')  formula = '2n+1';
2226          if (mm = formula.match(/^(\d+)$/)) // digit only
2227            return '[' + fragment + "= " + mm[1] + ']';
2228          if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2229            if (mm[1] == "-") mm[1] = -1;
2230            var a = mm[1] ? Number(mm[1]) : 1;
2231            var b = mm[2] ? Number(mm[2]) : 0;
2232            predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
2233            "((#{fragment} - #{b}) div #{a} >= 0)]";
2234            return new Template(predicate).evaluate({
2235              fragment: fragment, a: a, b: b });
2236          }
2237        }
2238      }
2239    },
2240  
2241    criteria: {
2242      tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
2243      className:    'n = h.className(n, r, "#{1}", c); c = false;',
2244      id:           'n = h.id(n, r, "#{1}", c);        c = false;',
2245      attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = false;',
2246      attr: function(m) {
2247        m[3] = (m[5] || m[6]);
2248        return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); c = false;').evaluate(m);
2249      },
2250      pseudo:       function(m) {
2251        if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
2252        return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
2253      },
2254      descendant:   'c = "descendant";',
2255      child:        'c = "child";',
2256      adjacent:     'c = "adjacent";',
2257      laterSibling: 'c = "laterSibling";'
2258    },
2259  
2260    patterns: {
2261      // combinators must be listed first
2262      // (and descendant needs to be last combinator)
2263      laterSibling: /^\s*~\s*/,
2264      child:        /^\s*>\s*/,
2265      adjacent:     /^\s*\+\s*/,
2266      descendant:   /^\s/,
2267  
2268      // selectors follow
2269      tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
2270      id:           /^#([\w\-\*]+)(\b|$)/,
2271      className:    /^\.([\w\-\*]+)(\b|$)/,
2272      pseudo:       /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|\s|(?=:))/,
2273      attrPresence: /^\[([\w]+)\]/,
2274      attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\]]*?)\4|([^'"][^\]]*?)))?\]/
2275    },
2276  
2277    handlers: {
2278      // UTILITY FUNCTIONS
2279      // joins two collections
2280      concat: function(a, b) {
2281        for (var i = 0, node; node = b[i]; i++)
2282          a.push(node);
2283        return a;
2284      },
2285  
2286      // marks an array of nodes for counting
2287      mark: function(nodes) {
2288        for (var i = 0, node; node = nodes[i]; i++)
2289          node._counted = true;
2290        return nodes;
2291      },
2292  
2293      unmark: function(nodes) {
2294        for (var i = 0, node; node = nodes[i]; i++)
2295          node._counted = undefined;
2296        return nodes;
2297      },
2298  
2299      // mark each child node with its position (for nth calls)
2300      // "ofType" flag indicates whether we're indexing for nth-of-type
2301      // rather than nth-child
2302      index: function(parentNode, reverse, ofType) {
2303        parentNode._counted = true;
2304        if (reverse) {
2305          for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
2306            node = nodes[i];
2307            if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
2308          }
2309        } else {
2310          for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
2311            if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
2312        }
2313      },
2314  
2315      // filters out duplicates and extends all nodes
2316      unique: function(nodes) {
2317        if (nodes.length == 0) return nodes;
2318        var results = [], n;
2319        for (var i = 0, l = nodes.length; i < l; i++)
2320          if (!(n = nodes[i])._counted) {
2321            n._counted = true;
2322            results.push(Element.extend(n));
2323          }
2324        return Selector.handlers.unmark(results);
2325      },
2326  
2327      // COMBINATOR FUNCTIONS
2328      descendant: function(nodes) {
2329        var h = Selector.handlers;
2330        for (var i = 0, results = [], node; node = nodes[i]; i++)
2331          h.concat(results, node.getElementsByTagName('*'));
2332        return results;
2333      },
2334  
2335      child: function(nodes) {
2336        var h = Selector.handlers;
2337        for (var i = 0, results = [], node; node = nodes[i]; i++) {
2338          for (var j = 0, children = [], child; child = node.childNodes[j]; j++)
2339            if (child.nodeType == 1 && child.tagName != '!') results.push(child);
2340        }
2341        return results;
2342      },
2343  
2344      adjacent: function(nodes) {
2345        for (var i = 0, results = [], node; node = nodes[i]; i++) {
2346          var next = this.nextElementSibling(node);
2347          if (next) results.push(next);
2348        }
2349        return results;
2350      },
2351  
2352      laterSibling: function(nodes) {
2353        var h = Selector.handlers;
2354        for (var i = 0, results = [], node; node = nodes[i]; i++)
2355          h.concat(results, Element.nextSiblings(node));
2356        return results;
2357      },
2358  
2359      nextElementSibling: function(node) {
2360        while (node = node.nextSibling)
2361            if (node.nodeType == 1) return node;
2362        return null;
2363      },
2364  
2365      previousElementSibling: function(node) {
2366        while (node = node.previousSibling)
2367          if (node.nodeType == 1) return node;
2368        return null;
2369      },
2370  
2371      // TOKEN FUNCTIONS
2372      tagName: function(nodes, root, tagName, combinator) {
2373        tagName = tagName.toUpperCase();
2374        var results = [], h = Selector.handlers;
2375        if (nodes) {
2376          if (combinator) {
2377            // fastlane for ordinary descendant combinators
2378            if (combinator == "descendant") {
2379              for (var i = 0, node; node = nodes[i]; i++)
2380                h.concat(results, node.getElementsByTagName(tagName));
2381              return results;
2382            } else nodes = this[combinator](nodes);
2383            if (tagName == "*") return nodes;
2384          }
2385          for (var i = 0, node; node = nodes[i]; i++)
2386            if (node.tagName.toUpperCase() == tagName) results.push(node);
2387          return results;
2388        } else return root.getElementsByTagName(tagName);
2389      },
2390  
2391      id: function(nodes, root, id, combinator) {
2392        var targetNode = $(id), h = Selector.handlers;
2393        if (!nodes && root == document) return targetNode ? [targetNode] : [];
2394        if (nodes) {
2395          if (combinator) {
2396            if (combinator == 'child') {
2397              for (var i = 0, node; node = nodes[i]; i++)
2398                if (targetNode.parentNode == node) return [targetNode];
2399            } else if (combinator == 'descendant') {
2400              for (var i = 0, node; node = nodes[i]; i++)
2401                if (Element.descendantOf(targetNode, node)) return [targetNode];
2402            } else if (combinator == 'adjacent') {
2403              for (var i = 0, node; node = nodes[i]; i++)
2404                if (Selector.handlers.previousElementSibling(targetNode) == node)
2405                  return [targetNode];
2406            } else nodes = h[combinator](nodes);
2407          }
2408          for (var i = 0, node; node = nodes[i]; i++)
2409            if (node == targetNode) return [targetNode];
2410          return [];
2411        }
2412        return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
2413      },
2414  
2415      className: function(nodes, root, className, combinator) {
2416        if (nodes && combinator) nodes = this[combinator](nodes);
2417        return Selector.handlers.byClassName(nodes, root, className);
2418      },
2419  
2420      byClassName: function(nodes, root, className) {
2421        if (!nodes) nodes = Selector.handlers.descendant([root]);
2422        var needle = ' ' + className + ' ';
2423        for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
2424          nodeClassName = node.className;
2425          if (nodeClassName.length == 0) continue;
2426          if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
2427            results.push(node);
2428        }
2429        return results;
2430      },
2431  
2432      attrPresence: function(nodes, root, attr) {
2433        var results = [];
2434        for (var i = 0, node; node = nodes[i]; i++)
2435          if (Element.hasAttribute(node, attr)) results.push(node);
2436        return results;
2437      },
2438  
2439      attr: function(nodes, root, attr, value, operator) {
2440        if (!nodes) nodes = root.getElementsByTagName("*");
2441        var handler = Selector.operators[operator], results = [];
2442        for (var i = 0, node; node = nodes[i]; i++) {
2443          var nodeValue = Element.readAttribute(node, attr);
2444          if (nodeValue === null) continue;
2445          if (handler(nodeValue, value)) results.push(node);
2446        }
2447        return results;
2448      },
2449  
2450      pseudo: function(nodes, name, value, root, combinator) {
2451        if (nodes && combinator) nodes = this[combinator](nodes);
2452        if (!nodes) nodes = root.getElementsByTagName("*");
2453        return Selector.pseudos[name](nodes, value, root);
2454      }
2455    },
2456  
2457    pseudos: {
2458      'first-child': function(nodes, value, root) {
2459        for (var i = 0, results = [], node; node = nodes[i]; i++) {
2460          if (Selector.handlers.previousElementSibling(node)) continue;
2461            results.push(node);
2462        }
2463        return results;
2464      },
2465      'last-child': function(nodes, value, root) {
2466        for (var i = 0, results = [], node; node = nodes[i]; i++) {
2467          if (Selector.handlers.nextElementSibling(node)) continue;
2468            results.push(node);
2469        }
2470        return results;
2471      },
2472      'only-child': function(nodes, value, root) {
2473        var h = Selector.handlers;
2474        for (var i = 0, results = [], node; node = nodes[i]; i++)
2475          if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
2476            results.push(node);
2477        return results;
2478      },
2479      'nth-child':        function(nodes, formula, root) {
2480        return Selector.pseudos.nth(nodes, formula, root);
2481      },
2482      'nth-last-child':   function(nodes, formula, root) {
2483        return Selector.pseudos.nth(nodes, formula, root, true);
2484      },
2485      'nth-of-type':      function(nodes, formula, root) {
2486        return Selector.pseudos.nth(nodes, formula, root, false, true);
2487      },
2488      'nth-last-of-type': function(nodes, formula, root) {
2489        return Selector.pseudos.nth(nodes, formula, root, true, true);
2490      },
2491      'first-of-type':    function(nodes, formula, root) {
2492        return Selector.pseudos.nth(nodes, "1", root, false, true);
2493      },
2494      'last-of-type':     function(nodes, formula, root) {
2495        return Selector.pseudos.nth(nodes, "1", root, true, true);
2496      },
2497      'only-of-type':     function(nodes, formula, root) {
2498        var p = Selector.pseudos;
2499        return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
2500      },
2501  
2502      // handles the an+b logic
2503      getIndices: function(a, b, total) {
2504        if (a == 0) return b > 0 ? [b] : [];
2505        return $R(1, total).inject([], function(memo, i) {
2506          if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
2507          return memo;
2508        });
2509      },
2510  
2511      // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
2512      nth: function(nodes, formula, root, reverse, ofType) {
2513        if (nodes.length == 0) return [];
2514        if (formula == 'even') formula = '2n+0';
2515        if (formula == 'odd')  formula = '2n+1';
2516        var h = Selector.handlers, results = [], indexed = [], m;
2517        h.mark(nodes);
2518        for (var i = 0, node; node = nodes[i]; i++) {
2519          if (!node.parentNode._counted) {
2520            h.index(node.parentNode, reverse, ofType);
2521            indexed.push(node.parentNode);
2522          }
2523        }
2524        if (formula.match(/^\d+$/)) { // just a number
2525          formula = Number(formula);
2526          for (var i = 0, node; node = nodes[i]; i++)
2527            if (node.nodeIndex == formula) results.push(node);
2528        } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
2529          if (m[1] == "-") m[1] = -1;
2530          var a = m[1] ? Number(m[1]) : 1;
2531          var b = m[2] ? Number(m[2]) : 0;
2532          var indices = Selector.pseudos.getIndices(a, b, nodes.length);
2533          for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
2534            for (var j = 0; j < l; j++)
2535              if (node.nodeIndex == indices[j]) results.push(node);
2536          }
2537        }
2538        h.unmark(nodes);
2539        h.unmark(indexed);
2540        return results;
2541      },
2542  
2543      'empty': function(nodes, value, root) {
2544        for (var i = 0, results = [], node; node = nodes[i]; i++) {
2545          // IE treats comments as element nodes
2546          if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
2547          results.push(node);
2548        }
2549        return results;
2550      },
2551  
2552      'not': function(nodes, selector, root) {
2553        var h = Selector.handlers, selectorType, m;
2554        var exclusions = new Selector(selector).findElements(root);
2555        h.mark(exclusions);
2556        for (var i = 0, results = [], node; node = nodes[i]; i++)
2557          if (!node._counted) results.push(node);
2558        h.unmark(exclusions);
2559        return results;
2560      },
2561  
2562      'enabled': function(nodes, value, root) {
2563        for (var i = 0, results = [], node; node = nodes[i]; i++)
2564          if (!node.disabled) results.push(node);
2565        return results;
2566      },
2567  
2568      'disabled': function(nodes, value, root) {
2569        for (var i = 0, results = [], node; node = nodes[i]; i++)
2570          if (node.disabled) results.push(node);
2571        return results;
2572      },
2573  
2574      'checked': function(nodes, value, root) {
2575        for (var i = 0, results = [], node; node = nodes[i]; i++)
2576          if (node.checked) results.push(node);
2577        return results;
2578      }
2579    },
2580  
2581    operators: {
2582      '=':  function(nv, v) { return nv == v; },
2583      '!=': function(nv, v) { return nv != v; },
2584      '^=': function(nv, v) { return nv.startsWith(v); },
2585      '$=': function(nv, v) { return nv.endsWith(v); },
2586      '*=': function(nv, v) { return nv.include(v); },
2587      '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
2588      '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
2589    },
2590  
2591    matchElements: function(elements, expression) {
2592      var matches = new Selector(expression).findElements(), h = Selector.handlers;
2593      h.mark(matches);
2594      for (var i = 0, results = [], element; element = elements[i]; i++)
2595        if (element._counted) results.push(element);
2596      h.unmark(matches);
2597      return results;
2598    },
2599  
2600    findElement: function(elements, expression, index) {
2601      if (typeof expression == 'number') {
2602        index = expression; expression = false;
2603      }
2604      return Selector.matchElements(elements, expression || '*')[index || 0];
2605    },
2606  
2607    findChildElements: function(element, expressions) {
2608      var exprs = expressions.join(','), expressions = [];
2609      exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
2610        expressions.push(m[1].strip());
2611      });
2612      var results = [], h = Selector.handlers;
2613      for (var i = 0, l = expressions.length, selector; i < l; i++) {
2614        selector = new Selector(expressions[i].strip());
2615        h.concat(results, selector.findElements(element));
2616      }
2617      return (l > 1) ? h.unique(results) : results;
2618    }
2619  });
2620  
2621  function $$() {
2622    return Selector.findChildElements(document, $A(arguments));
2623  }
2624  var Form = {
2625    reset: function(form) {
2626      $(form).reset();
2627      return form;
2628    },
2629  
2630    serializeElements: function(elements, getHash) {
2631      var data = elements.inject({}, function(result, element) {
2632        if (!element.disabled && element.name) {
2633          var key = element.name, value = $(element).getValue();
2634          if (value != null) {
2635               if (key in result) {
2636              if (result[key].constructor != Array) result[key] = [result[key]];
2637              result[key].push(value);
2638            }
2639            else result[key] = value;
2640          }
2641        }
2642        return result;
2643      });
2644  
2645      return getHash ? data : Hash.toQueryString(data);
2646    }
2647  };
2648  
2649  Form.Methods = {
2650    serialize: function(form, getHash) {
2651      return Form.serializeElements(Form.getElements(form), getHash);
2652    },
2653  
2654    getElements: function(form) {
2655      return $A($(form).getElementsByTagName('*')).inject([],
2656        function(elements, child) {
2657          if (Form.Element.Serializers[child.tagName.toLowerCase()])
2658            elements.push(Element.extend(child));
2659          return elements;
2660        }
2661      );
2662    },
2663  
2664    getInputs: function(form, typeName, name) {
2665      form = $(form);
2666      var inputs = form.getElementsByTagName('input');
2667  
2668      if (!typeName && !name) return $A(inputs).map(Element.extend);
2669  
2670      for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
2671        var input = inputs[i];
2672        if ((typeName && input.type != typeName) || (name && input.name != name))
2673          continue;
2674        matchingInputs.push(Element.extend(input));
2675      }
2676  
2677      return matchingInputs;
2678    },
2679  
2680    disable: function(form) {
2681      form = $(form);
2682      Form.getElements(form).invoke('disable');
2683      return form;
2684    },
2685  
2686    enable: function(form) {
2687      form = $(form);
2688      Form.getElements(form).invoke('enable');
2689      return form;
2690    },
2691  
2692    findFirstElement: function(form) {
2693      return $(form).getElements().find(function(element) {
2694        return element.type != 'hidden' && !element.disabled &&
2695          ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
2696      });
2697    },
2698  
2699    focusFirstElement: function(form) {
2700      form = $(form);
2701      form.findFirstElement().activate();
2702      return form;
2703    },
2704  
2705    request: function(form, options) {
2706      form = $(form), options = Object.clone(options || {});
2707  
2708      var params = options.parameters;
2709      options.parameters = form.serialize(true);
2710  
2711      if (params) {
2712        if (typeof params == 'string') params = params.toQueryParams();
2713        Object.extend(options.parameters, params);
2714      }
2715  
2716      if (form.hasAttribute('method') && !options.method)
2717        options.method = form.method;
2718  
2719      return new Ajax.Request(form.readAttribute('action'), options);
2720    }
2721  }
2722  
2723  /*--------------------------------------------------------------------------*/
2724  
2725  Form.Element = {
2726    focus: function(element) {
2727      $(element).focus();
2728      return element;
2729    },
2730  
2731    select: function(element) {
2732      $(element).select();
2733      return element;
2734    }
2735  }
2736  
2737  Form.Element.Methods = {
2738    serialize: function(element) {
2739      element = $(element);
2740      if (!element.disabled && element.name) {
2741        var value = element.getValue();
2742        if (value != undefined) {
2743          var pair = {};
2744          pair[element.name] = value;
2745          return Hash.toQueryString(pair);
2746        }
2747      }
2748      return '';
2749    },
2750  
2751    getValue: function(element) {
2752      element = $(element);
2753      var method = element.tagName.toLowerCase();
2754      return Form.Element.Serializers[method](element);
2755    },
2756  
2757    clear: function(element) {
2758      $(element).value = '';
2759      return element;
2760    },
2761  
2762    present: function(element) {
2763      return $(element).value != '';
2764    },
2765  
2766    activate: function(element) {
2767      element = $(element);
2768      try {
2769        element.focus();
2770        if (element.select && (element.tagName.toLowerCase() != 'input' ||
2771          !['button', 'reset', 'submit'].include(element.type)))
2772          element.select();
2773      } catch (e) {}
2774      return element;
2775    },
2776  
2777    disable: function(element) {
2778      element = $(element);
2779      element.blur();
2780      element.disabled = true;
2781      return element;
2782    },
2783  
2784    enable: function(element) {
2785      element = $(element);
2786      element.disabled = false;
2787      return element;
2788    }
2789  }
2790  
2791  /*--------------------------------------------------------------------------*/
2792  
2793  var Field = Form.Element;
2794  var $F = Form.Element.Methods.getValue;
2795  
2796  /*--------------------------------------------------------------------------*/
2797  
2798  Form.Element.Serializers = {
2799    input: function(element) {
2800      switch (element.type.toLowerCase()) {
2801        case 'checkbox':
2802        case 'radio':
2803          return Form.Element.Serializers.inputSelector(element);
2804        default:
2805          return Form.Element.Serializers.textarea(element);
2806      }
2807    },
2808  
2809    inputSelector: function(element) {
2810      return element.checked ? element.value : null;
2811    },
2812  
2813    textarea: function(element) {
2814      return element.value;
2815    },
2816  
2817    select: function(element) {
2818      return this[element.type == 'select-one' ?
2819        'selectOne' : 'selectMany'](element);
2820    },
2821  
2822    selectOne: function(element) {
2823      var index = element.selectedIndex;
2824      return index >= 0 ? this.optionValue(element.options[index]) : null;
2825    },
2826  
2827    selectMany: function(element) {
2828      var values, length = element.length;
2829      if (!length) return null;
2830  
2831      for (var i = 0, values = []; i < length; i++) {
2832        var opt = element.options[i];
2833        if (opt.selected) values.push(this.optionValue(opt));
2834      }
2835      return values;
2836    },
2837  
2838    optionValue: function(opt) {
2839      // extend element because hasAttribute may not be native
2840      return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
2841    }
2842  }
2843  
2844  /*--------------------------------------------------------------------------*/
2845  
2846  Abstract.TimedObserver = function() {}
2847  Abstract.TimedObserver.prototype = {
2848    initialize: function(element, frequency, callback) {
2849      this.frequency = frequency;
2850      this.element   = $(element);
2851      this.callback  = callback;
2852  
2853      this.lastValue = this.getValue();
2854      this.registerCallback();
2855    },
2856  
2857    registerCallback: function() {
2858      setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
2859    },
2860  
2861    onTimerEvent: function() {
2862      var value = this.getValue();
2863      var changed = ('string' == typeof this.lastValue && 'string' == typeof value
2864        ? this.lastValue != value : String(this.lastValue) != String(value));
2865      if (changed) {
2866        this.callback(this.element, value);
2867        this.lastValue = value;
2868      }
2869    }
2870  }
2871  
2872  Form.Element.Observer = Class.create();
2873  Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
2874    getValue: function() {
2875      return Form.Element.getValue(this.element);
2876    }
2877  });
2878  
2879  Form.Observer = Class.create();
2880  Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
2881    getValue: function() {
2882      return Form.serialize(this.element);
2883    }
2884  });
2885  
2886  /*--------------------------------------------------------------------------*/
2887  
2888  Abstract.EventObserver = function() {}
2889  Abstract.EventObserver.prototype = {
2890    initialize: function(element, callback) {
2891      this.element  = $(element);
2892      this.callback = callback;
2893  
2894      this.lastValue = this.getValue();
2895      if (this.element.tagName.toLowerCase() == 'form')
2896        this.registerFormCallbacks();
2897      else
2898        this.registerCallback(this.element);
2899    },
2900  
2901    onElementEvent: function() {
2902      var value = this.getValue();
2903      if (this.lastValue != value) {
2904        this.callback(this.element, value);
2905        this.lastValue = value;
2906      }
2907    },
2908  
2909    registerFormCallbacks: function() {
2910      Form.getElements(this.element).each(this.registerCallback.bind(this));
2911    },
2912  
2913    registerCallback: function(element) {
2914      if (element.type) {
2915        switch (element.type.toLowerCase()) {
2916          case 'checkbox':
2917          case 'radio':
2918            Event.observe(element, 'click', this.onElementEvent.bind(this));
2919            break;
2920          default:
2921            Event.observe(element, 'change', this.onElementEvent.bind(this));
2922            break;
2923        }
2924      }
2925    }
2926  }
2927  
2928  Form.Element.EventObserver = Class.create();
2929  Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
2930    getValue: function() {
2931      return Form.Element.getValue(this.element);
2932    }
2933  });
2934  
2935  Form.EventObserver = Class.create();
2936  Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
2937    getValue: function() {
2938      return Form.serialize(this.element);
2939    }
2940  });
2941  if (!window.Event) {
2942    var Event = new Object();
2943  }
2944  
2945  Object.extend(Event, {
2946    KEY_BACKSPACE: 8,
2947    KEY_TAB:       9,
2948    KEY_RETURN:   13,
2949    KEY_ESC:      27,
2950    KEY_LEFT:     37,
2951    KEY_UP:       38,
2952    KEY_RIGHT:    39,
2953    KEY_DOWN:     40,
2954    KEY_DELETE:   46,
2955    KEY_HOME:     36,
2956    KEY_END:      35,
2957    KEY_PAGEUP:   33,
2958    KEY_PAGEDOWN: 34,
2959  
2960    element: function(event) {
2961      return $(event.target || event.srcElement);
2962    },
2963  
2964    isLeftClick: function(event) {
2965      return (((event.which) && (event.which == 1)) ||
2966              ((event.button) && (event.button == 1)));
2967    },
2968  
2969    pointerX: function(event) {
2970      return event.pageX || (event.clientX +
2971        (document.documentElement.scrollLeft || document.body.scrollLeft));
2972    },
2973  
2974    pointerY: function(event) {
2975      return event.pageY || (event.clientY +
2976        (document.documentElement.scrollTop || document.body.scrollTop));
2977    },
2978  
2979    stop: function(event) {
2980      if (event.preventDefault) {
2981        event.preventDefault();
2982        event.stopPropagation();
2983      } else {
2984        event.returnValue = false;
2985        event.cancelBubble = true;
2986      }
2987    },
2988  
2989    // find the first node with the given tagName, starting from the
2990    // node the event was triggered on; traverses the DOM upwards
2991    findElement: function(event, tagName) {
2992      var element = Event.element(event);
2993      while (element.parentNode && (!element.tagName ||
2994          (element.tagName.toUpperCase() != tagName.toUpperCase())))
2995        element = element.parentNode;
2996      return element;
2997    },
2998  
2999    observers: false,
3000  
3001    _observeAndCache: function(element, name, observer, useCapture) {
3002      if (!this.observers) this.observers = [];
3003      if (element.addEventListener) {
3004        this.observers.push([element, name, observer, useCapture]);
3005        element.addEventListener(name, observer, useCapture);
3006      } else if (element.attachEvent) {
3007        this.observers.push([element, name, observer, useCapture]);
3008        element.attachEvent('on' + name, observer);
3009      }
3010    },
3011  
3012    unloadCache: function() {
3013      if (!Event.observers) return;
3014      for (var i = 0, length = Event.observers.length; i < length; i++) {
3015        Event.stopObserving.apply(this, Event.observers[i]);
3016        Event.observers[i][0] = null;
3017      }
3018      Event.observers = false;
3019    },
3020  
3021    observe: function(element, name, observer, useCapture) {
3022      element = $(element);
3023      useCapture = useCapture || false;
3024  
3025      if (name == 'keypress' &&
3026        (Prototype.Browser.WebKit || element.attachEvent))
3027        name = 'keydown';
3028  
3029      Event._observeAndCache(element, name, observer, useCapture);
3030    },
3031  
3032    stopObserving: function(element, name, observer, useCapture) {
3033      element = $(element);
3034      useCapture = useCapture || false;
3035  
3036      if (name == 'keypress' &&
3037          (Prototype.Browser.WebKit || element.attachEvent))
3038        name = 'keydown';
3039  
3040      if (element.removeEventListener) {
3041        element.removeEventListener(name, observer, useCapture);
3042      } else if (element.detachEvent) {
3043        try {
3044          element.detachEvent('on' + name, observer);
3045        } catch (e) {}
3046      }
3047    }
3048  });
3049  
3050  /* prevent memory leaks in IE */
3051  if (Prototype.Browser.IE)
3052    Event.observe(window, 'unload', Event.unloadCache, false);
3053  var Position = {
3054    // set to true if needed, warning: firefox performance problems
3055    // NOT neeeded for page scrolling, only if draggable contained in
3056    // scrollable elements
3057    includeScrollOffsets: false,
3058  
3059    // must be called before calling withinIncludingScrolloffset, every time the
3060    // page is scrolled
3061    prepare: function() {
3062      this.deltaX =  window.pageXOffset
3063                  || document.documentElement.scrollLeft
3064                  || document.body.scrollLeft
3065                  || 0;
3066      this.deltaY =  window.pageYOffset
3067                  || document.documentElement.scrollTop
3068                  || document.body.scrollTop
3069                  || 0;
3070    },
3071  
3072    realOffset: function(element) {
3073      var valueT = 0, valueL = 0;
3074      do {
3075        valueT += element.scrollTop  || 0;
3076        valueL += element.scrollLeft || 0;
3077        element = element.parentNode;
3078      } while (element);
3079      return [valueL, valueT];
3080    },
3081  
3082    cumulativeOffset: function(element) {
3083      var valueT = 0, valueL = 0;
3084      do {
3085        valueT += element.offsetTop  || 0;
3086        valueL += element.offsetLeft || 0;
3087        element = element.offsetParent;
3088      } while (element);
3089      return [valueL, valueT];
3090    },
3091  
3092    positionedOffset: function(element) {
3093      var valueT = 0, valueL = 0;
3094      do {
3095        valueT += element.offsetTop  || 0;
3096        valueL += element.offsetLeft || 0;
3097        element = element.offsetParent;
3098        if (element) {
3099          if(element.tagName=='BODY') break;
3100          var p = Element.getStyle(element, 'position');
3101          if (p == 'relative' || p == 'absolute') break;
3102        }
3103      } while (element);
3104      return [valueL, valueT];
3105    },
3106  
3107    offsetParent: function(element) {
3108      if (element.offsetParent) return element.offsetParent;
3109      if (element == document.body) return element;
3110  
3111      while ((element = element.parentNode) && element != document.body)
3112        if (Element.getStyle(element, 'position') != 'static')
3113          return element;
3114  
3115      return document.body;
3116    },
3117  
3118    // caches x/y coordinate pair to use with overlap
3119    within: function(element, x, y) {
3120      if (this.includeScrollOffsets)
3121        return this.withinIncludingScrolloffsets(element, x, y);
3122      this.xcomp = x;
3123      this.ycomp = y;
3124      this.offset = this.cumulativeOffset(element);
3125  
3126      return (y >= this.offset[1] &&
3127              y <  this.offset[1] + element.offsetHeight &&
3128              x >= this.offset[0] &&
3129              x <  this.offset[0] + element.offsetWidth);
3130    },
3131  
3132    withinIncludingScrolloffsets: function(element, x, y) {
3133      var offsetcache = this.realOffset(element);
3134  
3135      this.xcomp = x + offsetcache[0] - this.deltaX;
3136      this.ycomp = y + offsetcache[1] - this.deltaY;
3137      this.offset = this.cumulativeOffset(element);
3138  
3139      return (this.ycomp >= this.offset[1] &&
3140              this.ycomp <  this.offset[1] + element.offsetHeight &&
3141              this.xcomp >= this.offset[0] &&
3142              this.xcomp <  this.offset[0] + element.offsetWidth);
3143    },
3144  
3145    // within must be called directly before
3146    overlap: function(mode, element) {
3147      if (!mode) return 0;
3148      if (mode == 'vertical')
3149        return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
3150          element.offsetHeight;
3151      if (mode == 'horizontal')
3152        return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
3153          element.offsetWidth;
3154    },
3155  
3156    page: function(forElement) {
3157      var valueT = 0, valueL = 0;
3158  
3159      var element = forElement;
3160      do {
3161        valueT += element.offsetTop  || 0;
3162        valueL += element.offsetLeft || 0;
3163  
3164        // Safari fix
3165        if (element.offsetParent == document.body)
3166          if (Element.getStyle(element,'position')=='absolute') break;
3167  
3168      } while (element = element.offsetParent);
3169  
3170      element = forElement;
3171      do {
3172        if (!window.opera || element.tagName=='BODY') {
3173          valueT -= element.scrollTop  || 0;
3174          valueL -= element.scrollLeft || 0;
3175        }
3176      } while (element = element.parentNode);
3177  
3178      return [valueL, valueT];
3179    },
3180  
3181    clone: function(source, target) {
3182      var options = Object.extend({
3183        setLeft:    true,
3184        setTop:     true,
3185        setWidth:   true,
3186        setHeight:  true,
3187        offsetTop:  0,
3188        offsetLeft: 0
3189      }, arguments[2] || {})
3190  
3191      // find page position of source
3192      source = $(source);
3193      var p = Position.page(source);
3194  
3195      // find coordinate system to use
3196      target = $(target);
3197      var delta = [0, 0];
3198      var parent = null;
3199      // delta [0,0] will do fine with position: fixed elements,
3200      // position:absolute needs offsetParent deltas
3201      if (Element.getStyle(target,'position') == 'absolute') {
3202        parent = Position.offsetParent(target);
3203        delta = Position.page(parent);
3204      }
3205  
3206      // correct by body offsets (fixes Safari)
3207      if (parent == document.body) {
3208        delta[0] -= document.body.offsetLeft;
3209        delta[1] -= document.body.offsetTop;
3210      }
3211  
3212      // set position
3213      if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
3214      if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
3215      if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
3216      if(options.setHeight) target.style.height = source.offsetHeight + 'px';
3217    },
3218  
3219    absolutize: function(element) {
3220      element = $(element);
3221      if (element.style.position == 'absolute') return;
3222      Position.prepare();
3223  
3224      var offsets = Position.positionedOffset(element);
3225      var top     = offsets[1];
3226      var left    = offsets[0];
3227      var width   = element.clientWidth;
3228      var height  = element.clientHeight;
3229  
3230      element._originalLeft   = left - parseFloat(element.style.left  || 0);
3231      element._originalTop    = top  - parseFloat(element.style.top || 0);
3232      element._originalWidth  = element.style.width;
3233      element._originalHeight = element.style.height;
3234  
3235      element.style.position = 'absolute';
3236      element.style.top    = top + 'px';
3237      element.style.left   = left + 'px';
3238      element.style.width  = width + 'px';
3239      element.style.height = height + 'px';
3240    },
3241  
3242    relativize: function(element) {
3243      element = $(element);
3244      if (element.style.position == 'relative') return;
3245      Position.prepare();
3246  
3247      element.style.position = 'relative';
3248      var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
3249      var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
3250  
3251      element.style.top    = top + 'px';
3252      element.style.left   = left + 'px';
3253      element.style.height = element._originalHeight;
3254      element.style.width  = element._originalWidth;
3255    }
3256  }
3257  
3258  // Safari returns margins on body which is incorrect if the child is absolutely
3259  // positioned.  For performance reasons, redefine Position.cumulativeOffset for
3260  // KHTML/WebKit only.
3261  if (Prototype.Browser.WebKit) {
3262    Position.cumulativeOffset = function(element) {
3263      var valueT = 0, valueL = 0;
3264      do {
3265        valueT += element.offsetTop  || 0;
3266        valueL += element.offsetLeft || 0;
3267        if (element.offsetParent == document.body)
3268          if (Element.getStyle(element, 'position') == 'absolute') break;
3269  
3270        element = element.offsetParent;
3271      } while (element);
3272  
3273      return [valueL, valueT];
3274    }
3275  }
3276  
3277  Element.addMethods();