Keep JS files locally

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1737 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

4 files changed, 2334 insertions, 0 deletions

diff --git a/railties/html/javascripts/controls.js b/railties/html/javascripts/controls.js
new file mode 100644
index 0000000000..60618838a8
--- /dev/null
+++ b/railties/html/javascripts/controls.js
@@ -0,0 +1,261 @@
+// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
+// 
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+Element.collectTextNodesIgnoreClass = function(element, ignoreclass) {
+  var children = $(element).childNodes;
+  var text     = "";
+  var classtest = new RegExp("^([^ ]+ )*" + ignoreclass+ "( [^ ]+)*$","i");
+  
+  for (var i = 0; i < children.length; i++) {
+    if(children[i].nodeType==3) {
+      text+=children[i].nodeValue;
+    } else {
+      if((!children[i].className.match(classtest)) && children[i].hasChildNodes())
+        text += Element.collectTextNodesIgnoreClass(children[i], ignoreclass);
+    }
+  }
+  
+  return text;
+}
+
+Ajax.Autocompleter = Class.create();
+Ajax.Autocompleter.prototype = (new Ajax.Base()).extend({
+  initialize: function(element, update, url, options) {
+    this.element     = $(element); 
+    this.update      = $(update);  
+    this.has_focus   = false; 
+    this.changed     = false; 
+    this.active      = false; 
+    this.index       = 0;     
+    this.entry_count = 0;    
+    this.url         = url;
+
+    this.setOptions(options);
+    this.options.asynchronous = true;
+    this.options.onComplete   = this.onComplete.bind(this)
+    this.options.frequency    = this.options.frequency || 0.4;
+    this.options.min_chars    = this.options.min_chars || 1;
+    this.options.method       = 'post';
+    
+    this.options.onShow = this.options.onShow || 
+      function(element, update){ 
+        if(!update.style.position || update.style.position=='absolute') {
+          update.style.position = 'absolute';
+          var offsets = Position.cumulativeOffset(element);
+          update.style.left = offsets[0] + 'px';
+          update.style.top  = (offsets[1] + element.offsetHeight) + 'px';
+          update.style.width = element.offsetWidth + 'px';
+        }
+        new Effect.Appear(update,{duration:0.3});
+      };
+    this.options.onHide = this.options.onHide || 
+      function(element, update){ new Effect.Fade(update,{duration:0.3}) };
+    
+    
+    if(this.options.indicator)
+      this.indicator = $(this.options.indicator);
+       
+    this.observer = null;
+    
+    Element.hide(this.update);
+    
+    Event.observe(this.element, "blur", this.onBlur.bindAsEventListener(this));
+    Event.observe(this.element, "keypress", this.onKeyPress.bindAsEventListener(this));
+  },
+  
+  show: function() {
+    if(this.update.style.display=='none') this.options.onShow(this.element, this.update);
+    if(!this.iefix && (navigator.appVersion.indexOf('MSIE')>0) && this.update.style.position=='absolute') {
+      new Insertion.After(this.update, 
+       '<iframe id="' + this.update.id + '_iefix" '+
+       'style="display:none;filter:progid:DXImageTransform.Microsoft.Alpha(apacity=0);" ' +
+       'src="javascript:;" frameborder="0" scrolling="no"></iframe>');
+      this.iefix = $(this.update.id+'_iefix');
+    }
+    if(this.iefix) {
+      Position.clone(this.update, this.iefix);
+      this.iefix.style.zIndex = 1;
+      this.update.style.zIndex = 2;
+      Element.show(this.iefix);
+    }
+  },
+  
+  hide: function() {
+    if(this.update.style.display=='') this.options.onHide(this.element, this.update);
+    if(this.iefix) Element.hide(this.iefix);
+  },
+  
+  startIndicator: function() {
+    if(this.indicator) Element.show(this.indicator);
+  },
+  
+  stopIndicator: function() {
+    if(this.indicator) Element.hide(this.indicator);
+  },
+  
+  onObserverEvent: function() {
+    this.changed = false;   
+    if(this.element.value.length>=this.options.min_chars) {
+      this.startIndicator();
+      this.options.parameters = this.options.callback ?
+        this.options.callback(this.element, Form.Element.getValue(this.element)) :
+          Form.Element.serialize(this.element);
+      new Ajax.Request(this.url, this.options);
+    } else {
+      this.active = false;
+      this.hide();
+    }
+  },
+  
+  addObservers: function(element) {
+    Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));
+    Event.observe(element, "click", this.onClick.bindAsEventListener(this));
+  },
+  
+  onComplete: function(request) {
+    if(!this.changed && this.has_focus) {
+      this.update.innerHTML = request.responseText;
+      Element.cleanWhitespace(this.update);
+      Element.cleanWhitespace(this.update.firstChild);
+
+      if(this.update.firstChild && this.update.firstChild.childNodes) {
+        this.entry_count = 
+          this.update.firstChild.childNodes.length;
+        for (var i = 0; i < this.entry_count; i++) {
+          entry = this.get_entry(i);
+          entry.autocompleteIndex = i;
+          this.addObservers(entry);
+        }
+      } else { 
+        this.entry_count = 0;
+      }
+      
+      this.stopIndicator();
+      
+      this.index = 0;
+      this.render();
+    }
+  },
+  
+  onKeyPress: function(event) {
+    if(this.active)
+      switch(event.keyCode) {
+       case Event.KEY_TAB:
+       case Event.KEY_RETURN:
+         this.select_entry();
+         Event.stop(event);
+       case Event.KEY_ESC:
+         this.hide();
+         this.active = false;
+         return;
+       case Event.KEY_LEFT:
+       case Event.KEY_RIGHT:
+         return;
+       case Event.KEY_UP:
+         this.mark_previous();
+         this.render();
+         if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event);
+         return;
+       case Event.KEY_DOWN:
+         this.mark_next();
+         this.render();
+         if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event);
+         return;
+      }
+     else 
+      if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN) 
+        return;
+    
+    this.changed = true;
+    this.has_focus = true;
+    
+    if(this.observer) clearTimeout(this.observer);
+      this.observer = 
+        setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);
+  },
+  
+  onHover: function(event) {
+    var element = Event.findElement(event, 'LI');
+    if(this.index != element.autocompleteIndex) 
+    {
+        this.index = element.autocompleteIndex;
+        this.render();
+    }
+    Event.stop(event);
+  },
+  
+  onClick: function(event) {
+    var element = Event.findElement(event, 'LI');
+    this.index = element.autocompleteIndex;
+    this.select_entry();
+    Event.stop(event);
+  },
+  
+  onBlur: function(event) {
+    // needed to make click events working
+    setTimeout(this.hide.bind(this), 250);
+    this.has_focus = false;
+    this.active = false;     
+  }, 
+  
+  render: function() {
+    if(this.entry_count > 0) {
+      for (var i = 0; i < this.entry_count; i++)
+        this.index==i ? 
+          Element.addClassName(this.get_entry(i),"selected") : 
+          Element.removeClassName(this.get_entry(i),"selected");
+        
+      if(this.has_focus) { 
+        if(this.get_current_entry().scrollIntoView) 
+          this.get_current_entry().scrollIntoView(false);
+        
+        this.show();
+        this.active = true;
+      }
+    } else this.hide();
+  },
+  
+  mark_previous: function() {
+    if(this.index > 0) this.index--
+      else this.index = this.entry_count-1;
+  },
+  
+  mark_next: function() {
+    if(this.index < this.entry_count-1) this.index++
+      else this.index = 0;
+  },
+  
+  get_entry: function(index) {
+    return this.update.firstChild.childNodes[index];
+  },
+  
+  get_current_entry: function() {
+    return this.get_entry(this.index);
+  },
+  
+  select_entry: function() {
+    this.active = false;
+    value = Element.collectTextNodesIgnoreClass(this.get_current_entry(), 'informal').unescapeHTML();
+    this.element.value = value;
+    this.element.focus();
+  }
+});
\ No newline at end of file
diff --git a/railties/html/javascripts/dragdrop.js b/railties/html/javascripts/dragdrop.js
new file mode 100644
index 0000000000..20432a3c88
--- /dev/null
+++ b/railties/html/javascripts/dragdrop.js
@@ -0,0 +1,476 @@
+// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
+// 
+// Element.Class part Copyright (c) 2005 by Rick Olson
+// 
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Element.Class = {
+    // Element.toggleClass(element, className) toggles the class being on/off
+    // Element.toggleClass(element, className1, className2) toggles between both classes,
+    //   defaulting to className1 if neither exist
+    toggle: function(element, className) {
+      if(Element.Class.has(element, className)) {
+        Element.Class.remove(element, className);
+        if(arguments.length == 3) Element.Class.add(element, arguments[2]);
+      } else {
+        Element.Class.add(element, className);
+        if(arguments.length == 3) Element.Class.remove(element, arguments[2]);
+      }
+    },
+
+    // gets space-delimited classnames of an element as an array
+    get: function(element) {
+      element = $(element);
+      return element.className.split(' ');
+    },
+
+    // functions adapted from original functions by Gavin Kistner
+    remove: function(element) {
+      element = $(element);
+      var regEx;
+      for(var i = 1; i < arguments.length; i++) {
+        regEx = new RegExp("^" + arguments[i] + "\\b\\s*|\\s*\\b" + arguments[i] + "\\b", 'g');
+        element.className = element.className.replace(regEx, '')
+      }
+    },
+
+    add: function(element) {
+      element = $(element);
+      for(var i = 1; i < arguments.length; i++) {
+        Element.Class.remove(element, arguments[i]);
+        element.className += (element.className.length > 0 ? ' ' : '') + arguments[i];
+      }
+    },
+
+    // returns true if all given classes exist in said element
+    has: function(element) {
+      element = $(element);
+      if(!element || !element.className) return false;
+      var regEx;
+      for(var i = 1; i < arguments.length; i++) {
+        regEx = new RegExp("\\b" + arguments[i] + "\\b");
+        if(!regEx.test(element.className)) return false;
+      }
+      return true;
+    },
+    
+    // expects arrays of strings and/or strings as optional paramters
+    // Element.Class.has_any(element, ['classA','classB','classC'], 'classD')
+    has_any: function(element) {
+      element = $(element);
+      if(!element || !element.className) return false;
+      var regEx;
+      for(var i = 1; i < arguments.length; i++) {
+        if((typeof arguments[i] == 'object') && 
+          (arguments[i].constructor == Array)) {
+          for(var j = 0; j < arguments[i].length; j++) {
+            regEx = new RegExp("\\b" + arguments[i][j] + "\\b");
+            if(regEx.test(element.className)) return true;
+          }
+        } else {
+          regEx = new RegExp("\\b" + arguments[i] + "\\b");
+          if(regEx.test(element.className)) return true;
+        }
+      }
+      return false;
+    },
+    
+    childrenWith: function(element, className) {
+      var children = $(element).getElementsByTagName('*');
+      var elements = new Array();
+      
+      for (var i = 0; i < children.length; i++) {
+        if (Element.Class.has(children[i], className)) {
+          elements.push(children[i]);
+          break;
+        }
+      }
+      
+      return elements;
+    }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var Droppables = {
+  drops: false,
+  
+  add: function(element) {
+    var element = $(element);
+    var options = {
+      greedy:     true,
+      hoverclass: null  
+    }.extend(arguments[1] || {});
+    
+    // cache containers
+    if(options.containment) {
+      options._containers = new Array();
+      var containment = options.containment;
+      if((typeof containment == 'object') && 
+        (containment.constructor == Array)) {
+        for(var i=0; i<containment.length; i++)
+          options._containers.push($(containment[i]));
+      } else {
+        options._containers.push($(containment));
+      }
+      options._containers_length = 
+        options._containers.length-1;
+    }
+    
+    if(element.style.position=='') //fix IE
+      element.style.position = 'relative'; 
+    
+    // activate the droppable
+    element.droppable = options;
+    
+    if(!this.drops) this.drops = [];
+    this.drops.push(element);
+  },
+  
+  is_contained: function(element, drop) {
+    var containers = drop.droppable._containers;
+    var parentNode = element.parentNode;
+    var i = drop.droppable._containers_length;
+    do { if(parentNode==containers[i]) return true; } while (i--);
+    return false;
+  },
+  
+  is_affected: function(pX, pY, element, drop) {
+    return (
+      (drop!=element) &&
+      ((!drop.droppable._containers) ||
+        this.is_contained(element, drop)) &&
+      ((!drop.droppable.accept) ||
+        (Element.Class.has_any(element, drop.droppable.accept))) &&
+      Position.within(drop, pX, pY) );
+  },
+  
+  deactivate: function(drop) {
+    Element.Class.remove(drop, drop.droppable.hoverclass);
+    this.last_active = null;
+  },
+  
+  activate: function(drop) {
+    if(this.last_active) this.deactivate(this.last_active);
+    if(drop.droppable.hoverclass) {
+      Element.Class.add(drop, drop.droppable.hoverclass);
+      this.last_active = drop;
+    }
+  },
+  
+  show: function(event, element) {
+    if(!this.drops) return;
+    var pX = Event.pointerX(event);
+    var pY = Event.pointerY(event);
+    Position.prepare();
+    
+    var i = this.drops.length-1; do {
+      var drop = this.drops[i];
+      if(this.is_affected(pX, pY, element, drop)) {
+        if(drop.droppable.onHover)
+           drop.droppable.onHover(
+            element, drop, Position.overlap(drop.droppable.overlap, drop));
+        if(drop.droppable.greedy) { 
+          this.activate(drop);
+          return;
+        }
+      }
+    } while (i--);
+  },
+  
+  fire: function(event, element) {
+    if(!this.drops) return;
+    var pX = Event.pointerX(event);
+    var pY = Event.pointerY(event);
+    Position.prepare();
+    
+    var i = this.drops.length-1; do {
+      var drop = this.drops[i];
+      if(this.is_affected(pX, pY, element, drop))
+        if(drop.droppable.onDrop)
+           drop.droppable.onDrop(element);
+    } while (i--);
+  },
+  
+  reset: function() {
+    if(this.last_active)
+      this.deactivate(this.last_active);
+  }
+}
+
+Draggables = {
+  observers: new Array(),
+  addObserver: function(observer) {
+    this.observers.push(observer);    
+  },
+  notify: function(eventName, draggable) {  // 'onStart', 'onEnd'
+    for(var i = 0; i < this.observers.length; i++)
+      this.observers[i][eventName](draggable);
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+Draggable = Class.create();
+Draggable.prototype = {
+  initialize: function(element) {
+    var options = {
+      handle: false,
+      starteffect: function(element) { 
+        new Effect.Opacity(element, {duration:0.2, from:1.0, to:0.7}); 
+      },
+      reverteffect: function(element, top_offset, left_offset) {
+        new Effect.MoveBy(element, -top_offset, -left_offset, {duration:0.4});
+      },
+      endeffect: function(element) { 
+         new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0}); 
+      },
+      zindex: 1000,
+      revert: false
+    }.extend(arguments[1] || {});
+    
+    this.element      = $(element);
+    this.element.drag = this;
+    this.handle       = options.handle ? $(options.handle) : this.element;
+    
+    // fix IE
+    if(!this.element.style.position)
+      this.element.style.position = 'relative';
+    
+    this.offsetX      = 0;
+    this.offsetY      = 0;
+    this.originalLeft = this.currentLeft();
+    this.originalTop  = this.currentTop();
+    this.originalX    = this.element.offsetLeft;
+    this.originalY    = this.element.offsetTop;
+    this.originalZ    = parseInt(this.element.style.zIndex || "0");
+    
+    this.options      = options;
+    
+    this.active       = false;
+    this.dragging     = false;   
+    
+    Event.observe(this.handle, "mousedown", this.startDrag.bindAsEventListener(this));
+    Event.observe(document, "mouseup", this.endDrag.bindAsEventListener(this));
+    Event.observe(document, "mousemove", this.update.bindAsEventListener(this));
+  },
+  currentLeft: function() {
+    return parseInt(this.element.style.left || '0');
+  },
+  currentTop: function() {
+    return parseInt(this.element.style.top || '0')
+  },
+  startDrag: function(event) {
+    if(Event.isLeftClick(event)) {
+      this.active = true;
+      
+      var style = this.element.style;
+      this.originalY = this.element.offsetTop  - this.currentTop()  - this.originalTop;
+      this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
+      this.offsetY =  event.clientY - this.originalY - this.originalTop;
+      this.offsetX =  event.clientX - this.originalX - this.originalLeft;
+      
+      Event.stop(event);
+    }
+  },
+  endDrag: function(event) {
+    if(this.active && this.dragging) {
+      this.active = false;
+      this.dragging = false;
+      
+      Droppables.fire(event, this.element);
+      Draggables.notify('onEnd', this);
+      
+      var revert = this.options.revert;
+      if(revert && typeof revert == 'function') revert = revert(this.element);
+      
+      if(revert && this.options.reverteffect) {
+        this.options.reverteffect(this.element, 
+          this.currentTop()-this.originalTop,
+          this.currentLeft()-this.originalLeft);
+      } else {
+        this.originalLeft = this.currentLeft();
+        this.originalTop  = this.currentTop();
+      }
+      this.element.style.zIndex = this.originalZ;
+     
+      if(this.options.endeffect) 
+        this.options.endeffect(this.element);
+      
+      Droppables.reset();
+      Event.stop(event);
+    }
+    this.active = false;
+    this.dragging = false;
+  },
+  draw: function(event) {
+    var style = this.element.style;
+    this.originalX = this.element.offsetLeft - this.currentLeft() - this.originalLeft;
+    this.originalY = this.element.offsetTop  - this.currentTop()  - this.originalTop;
+    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
+      style.left = ((event.clientX - this.originalX) - this.offsetX) + "px";
+    if((!this.options.constraint) || (this.options.constraint=='vertical'))
+      style.top  = ((event.clientY - this.originalY) - this.offsetY) + "px";
+    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
+  },
+  update: function(event) {
+   if(this.active) {
+      if(!this.dragging) {
+        var style = this.element.style;
+        this.dragging = true;
+        if(style.position=="") style.position = "relative";
+        style.zIndex = this.options.zindex;
+        Draggables.notify('onStart', this);
+        if(this.options.starteffect) this.options.starteffect(this.element);
+      }
+      
+      Droppables.show(event, this.element);
+      this.draw(event);
+      if(this.options.change) this.options.change(this);
+      
+      // fix AppleWebKit rendering
+      if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0); 
+      
+      Event.stop(event);
+   }
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+SortableObserver = Class.create();
+SortableObserver.prototype = {
+  initialize: function(element, observer) {
+    this.element   = $(element);
+    this.observer  = observer;
+    this.lastValue = Sortable.serialize(this.element);
+  },
+  onStart: function() {
+    this.lastValue = Sortable.serialize(this.element);
+  },
+  onEnd: function() {    
+    if(this.lastValue != Sortable.serialize(this.element))
+      this.observer(this.element)
+  }
+}
+
+Sortable = {
+  create: function(element) {
+    var element = $(element);
+    var options = { 
+      tag:         'li',       // assumes li children, override with tag: 'tagname'
+      overlap:     'vertical', // one of 'vertical', 'horizontal'
+      constraint:  'vertical', // one of 'vertical', 'horizontal', false
+      containment: element,    // also takes array of elements (or id's); or false
+      handle:      false,      // or a CSS class
+      only:        false,
+      hoverclass:  null,
+      onChange:    function() {},
+      onUpdate:    function() {}
+    }.extend(arguments[1] || {});
+    element.sortable = options;
+    
+    // build options for the draggables
+    var options_for_draggable = {
+      revert:      true,
+      constraint:  options.constraint,
+      handle:      handle };
+    if(options.starteffect)
+      options_for_draggable.starteffect = options.starteffect;
+    if(options.reverteffect)
+      options_for_draggable.reverteffect = options.reverteffect;
+    if(options.endeffect)
+      options_for_draggable.endeffect = options.endeffect;
+    if(options.zindex)
+      options_for_draggable.zindex = options.zindex;
+    
+    // build options for the droppables  
+    var options_for_droppable = {
+      overlap:     options.overlap,
+      containment: options.containment,
+      hoverclass:  options.hoverclass,
+      onHover: function(element, dropon, overlap) { 
+        if(overlap>0.5) {
+          if(dropon.previousSibling != element) {
+            var oldParentNode = element.parentNode;
+            element.style.visibility = "hidden"; // fix gecko rendering
+            dropon.parentNode.insertBefore(element, dropon);
+            if(dropon.parentNode!=oldParentNode && oldParentNode.sortable) 
+              oldParentNode.sortable.onChange(element);
+            if(dropon.parentNode.sortable)
+              dropon.parentNode.sortable.onChange(element);
+          }
+        } else {                
+          var nextElement = dropon.nextSibling || null;
+          if(nextElement != element) {
+            var oldParentNode = element.parentNode;
+            element.style.visibility = "hidden"; // fix gecko rendering
+            dropon.parentNode.insertBefore(element, nextElement);
+            if(dropon.parentNode!=oldParentNode && oldParentNode.sortable) 
+              oldParentNode.sortable.onChange(element);
+            if(dropon.parentNode.sortable)
+              dropon.parentNode.sortable.onChange(element);
+          }
+        }
+      }
+    }
+
+    // fix for gecko engine
+    Element.cleanWhitespace(element); 
+    
+    // for onupdate
+    Draggables.addObserver(new SortableObserver(element, options.onUpdate));
+    
+    // make it so 
+    var elements = element.childNodes;
+    for (var i = 0; i < elements.length; i++) 
+      if(elements[i].tagName && elements[i].tagName==options.tag.toUpperCase() &&
+        (!options.only || (Element.Class.has(elements[i], options.only)))) {
+        
+        // handles are per-draggable
+        var handle = options.handle ? 
+          Element.Class.childrenWith(elements[i], options.handle)[0] : elements[i];
+        
+        new Draggable(elements[i], options_for_draggable.extend({ handle: handle }));
+        Droppables.add(elements[i], options_for_droppable);
+      }
+      
+  },
+  serialize: function(element) {
+    var element = $(element);
+    var options = {
+      tag:  element.sortable.tag,
+      only: element.sortable.only,
+      name: element.id
+    }.extend(arguments[1] || {});
+    
+    var items = $(element).childNodes;
+    var queryComponents = new Array();
+ 
+    for(var i=0; i<items.length; i++)
+      if(items[i].tagName && items[i].tagName==options.tag.toUpperCase() &&
+        (!options.only || (Element.Class.has(items[i], options.only))))
+        queryComponents.push(
+          encodeURIComponent(options.name) + "[]=" + 
+          encodeURIComponent(items[i].id.split("_")[1]));
+
+    return queryComponents.join("&");
+  }
+} 
\ No newline at end of file
diff --git a/railties/html/javascripts/effects.js b/railties/html/javascripts/effects.js
new file mode 100644
index 0000000000..73accbd139
--- /dev/null
+++ b/railties/html/javascripts/effects.js
@@ -0,0 +1,570 @@
+// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
+//
+// Parts (c) 2005 Justin Palmer (http://encytemedia.com/)
+// Parts (c) 2005 Mark Pilgrim (http://diveintomark.org/)
+// 
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+Effect = {}
+Effect2 = Effect; // deprecated
+
+/* ------------- transitions ------------- */
+
+Effect.Transitions = {}
+
+Effect.Transitions.linear = function(pos) {
+  return pos;
+}
+Effect.Transitions.sinoidal = function(pos) {
+  return (-Math.cos(pos*Math.PI)/2) + 0.5;
+}
+Effect.Transitions.reverse  = function(pos) {
+  return 1-pos;
+}
+Effect.Transitions.flicker = function(pos) {
+  return ((-Math.cos(pos*Math.PI)/4) + 0.75) + Math.random(0.25);
+}
+Effect.Transitions.wobble = function(pos) {
+  return (-Math.cos(pos*Math.PI*(9*pos))/2) + 0.5;
+}
+Effect.Transitions.pulse = function(pos) {
+   return (Math.floor(pos*10) % 2 == 0 ? 
+    (pos*10-Math.floor(pos*10)) : 1-(pos*10-Math.floor(pos*10)));
+}
+
+Effect.Transitions.none = function(pos) {
+    return 0;
+}
+Effect.Transitions.full = function(pos) {
+    return 1;
+}
+
+/* ------------- core effects ------------- */
+
+Effect.Base = function() {};
+Effect.Base.prototype = {
+  setOptions: function(options) {
+    this.options = {
+      transition: Effect.Transitions.sinoidal,
+      duration:   1.0,   // seconds
+      fps:        25.0,  // max. 100fps
+      sync:       false, // true for combining
+      from:       0.0,
+      to:         1.0
+    }.extend(options || {});
+  },
+  start: function(options) {
+    this.setOptions(options || {});
+    this.currentFrame    = 0;
+    this.startOn  = new Date().getTime();
+    this.finishOn = this.startOn + (this.options.duration*1000);
+    if(this.options.beforeStart) this.options.beforeStart(this);
+    if(!this.options.sync) this.loop();  
+  },
+  loop: function() {
+    timePos = new Date().getTime();
+    if(timePos >= this.finishOn) {
+      this.render(this.options.to);
+      if(this.finish) this.finish(); 
+      if(this.options.afterFinish) this.options.afterFinish(this);
+      return;  
+    }
+    pos   = (timePos - this.startOn) / (this.finishOn - this.startOn);
+    frame = Math.round(pos * this.options.fps * this.options.duration);
+    if(frame > this.currentFrame) {
+      this.render(pos);
+      this.currentFrame = frame;
+    }
+    this.timeout = setTimeout(this.loop.bind(this), 10);
+  },
+  render: function(pos) {
+    if(this.options.transition) pos = this.options.transition(pos);
+    pos  = pos * (this.options.to-this.options.from);
+    pos += this.options.from; 
+    if(this.options.beforeUpdate) this.options.beforeUpdate(this);
+    if(this.update) this.update(pos);
+    if(this.options.afterUpdate) this.options.afterUpdate(this);  
+  },
+  cancel: function() {
+    if(this.timeout) clearTimeout(this.timeout);
+  }
+}
+
+Effect.Parallel = Class.create();
+  Effect.Parallel.prototype = (new Effect.Base()).extend({
+    initialize: function(effects) {
+      this.effects = effects || [];
+       this.start(arguments[1]);
+    },
+    update: function(position) {
+       for (var i = 0; i < this.effects.length; i++)
+        this.effects[i].render(position);  
+    },
+    finish: function(position) {
+       for (var i = 0; i < this.effects.length; i++)
+          if(this.effects[i].finish) this.effects[i].finish(position);
+    }
+  });
+
+// Internet Explorer caveat: works only on elements the have
+// a 'layout', meaning having a given width or height. 
+// There is no way to safely set this automatically.
+Effect.Opacity = Class.create();
+Effect.Opacity.prototype = (new Effect.Base()).extend({
+  initialize: function(element) {
+    this.element = $(element);
+    options = {
+      from: 0.0,
+      to:   1.0
+    }.extend(arguments[1] || {});
+    this.start(options);
+  },
+  update: function(position) {
+    this.setOpacity(position);
+  }, 
+  setOpacity: function(opacity) {
+    opacity = (opacity == 1) ? 0.99999 : opacity;
+    this.element.style.opacity = opacity;
+    this.element.style.filter = "alpha(opacity:"+opacity*100+")";
+  }
+});
+
+Effect.MoveBy = Class.create();
+ Effect.MoveBy.prototype = (new Effect.Base()).extend({
+   initialize: function(element, toTop, toLeft) {
+     this.element      = $(element);
+     this.originalTop  = parseFloat(this.element.style.top || '0');
+     this.originalLeft = parseFloat(this.element.style.left || '0');
+     this.toTop        = toTop;
+     this.toLeft       = toLeft;
+     if(this.element.style.position == "")
+       this.element.style.position = "relative";
+     this.start(arguments[3]);
+   },
+   update: function(position) {
+     topd  = this.toTop  * position + this.originalTop;
+     leftd = this.toLeft * position + this.originalLeft;
+     this.setPosition(topd, leftd);
+   },
+   setPosition: function(topd, leftd) {
+     this.element.style.top  = topd  + "px";
+     this.element.style.left = leftd + "px";
+   }
+});
+
+Effect.Scale = Class.create();
+Effect.Scale.prototype = (new Effect.Base()).extend({
+  initialize: function(element, percent) {
+    this.element = $(element)
+    options = {
+      scaleX: true,
+      scaleY: true,
+      scaleContent: true,
+      scaleFromCenter: false,
+      scaleMode: 'box',        // 'box' or 'contents' or {} with provided values
+      scaleFrom: 100.0
+    }.extend(arguments[2] || {});
+    this.originalTop    = this.element.offsetTop;
+    this.originalLeft   = this.element.offsetLeft;
+    if (this.element.style.fontSize=="") this.sizeEm = 1.0;
+    if (this.element.style.fontSize && this.element.style.fontSize.indexOf("em")>0)
+       this.sizeEm      = parseFloat(this.element.style.fontSize);
+    this.factor = (percent/100.0) - (options.scaleFrom/100.0);
+    if(options.scaleMode=='box') {
+      this.originalHeight = this.element.clientHeight;
+      this.originalWidth  = this.element.clientWidth; 
+    } else 
+    if(options.scaleMode=='contents') {
+      this.originalHeight = this.element.scrollHeight;
+      this.originalWidth  = this.element.scrollWidth;
+    } else {
+      this.originalHeight = options.scaleMode.originalHeight;
+      this.originalWidth  = options.scaleMode.originalWidth;
+    }
+    this.start(options);
+  },
+
+  update: function(position) {
+    currentScale = (this.options.scaleFrom/100.0) + (this.factor * position);
+    if(this.options.scaleContent && this.sizeEm) 
+      this.element.style.fontSize = this.sizeEm*currentScale + "em";
+    this.setDimensions(
+     this.originalWidth * currentScale, 
+     this.originalHeight * currentScale);
+  },
+
+  setDimensions: function(width, height) {
+    if(this.options.scaleX) this.element.style.width = width + 'px';
+    if(this.options.scaleY) this.element.style.height = height + 'px';
+    if(this.options.scaleFromCenter) {
+      topd  = (height - this.originalHeight)/2;
+      leftd = (width  - this.originalWidth)/2;
+      if(this.element.style.position=='absolute') {
+        if(this.options.scaleY) this.element.style.top = this.originalTop-topd + "px";
+        if(this.options.scaleX) this.element.style.left = this.originalLeft-leftd + "px";
+      } else {
+        if(this.options.scaleY) this.element.style.top = -topd + "px";
+        if(this.options.scaleX) this.element.style.left = -leftd + "px";
+      }
+    }
+  }
+});
+
+Effect.Highlight = Class.create();
+Effect.Highlight.prototype = (new Effect.Base()).extend({
+  initialize: function(element) {
+    this.element = $(element);
+    
+    // try to parse current background color as default for endcolor
+    // browser stores this as: "rgb(255, 255, 255)", convert to "#ffffff" format
+    var endcolor = "#ffffff";
+    var current = this.element.style.backgroundColor;
+    if(current && current.slice(0,4) == "rgb(") {
+      endcolor = "#";
+      var cols = current.slice(4,current.length-1).split(',');
+      var i=0; do { endcolor += parseInt(cols[i]).toColorPart() } while (++i<3); }
+      
+    var options = {
+      startcolor: "#ffff99",
+      endcolor:   endcolor
+    }.extend(arguments[1] || {});
+    
+    // init color calculations
+    this.colors_base = [
+      parseInt(options.startcolor.slice(1,3),16),
+      parseInt(options.startcolor.slice(3,5),16),
+      parseInt(options.startcolor.slice(5),16) ];
+    this.colors_delta = [
+      parseInt(options.endcolor.slice(1,3),16)-this.colors_base[0],
+      parseInt(options.endcolor.slice(3,5),16)-this.colors_base[1],
+      parseInt(options.endcolor.slice(5),16)-this.colors_base[2] ];
+
+    this.start(options);
+  },
+  update: function(position) {
+    var colors = [
+      Math.round(this.colors_base[0]+(this.colors_delta[0]*position)),
+      Math.round(this.colors_base[1]+(this.colors_delta[1]*position)),
+      Math.round(this.colors_base[2]+(this.colors_delta[2]*position)) ];
+    this.element.style.backgroundColor = "#" +
+      colors[0].toColorPart() + colors[1].toColorPart() + colors[2].toColorPart();
+  }
+});
+
+
+/* ------------- prepackaged effects ------------- */
+
+Effect.Fade =  function(element) {
+  options = {
+  from: 1.0,
+  to:   0.0,
+  afterFinish: function(effect) 
+    { Element.hide(effect.element);
+      effect.setOpacity(1); } 
+  }.extend(arguments[1] || {});
+  new Effect.Opacity(element,options);
+}
+
+Effect.Appear =  function(element) {
+  options = {
+  from: 0.0,
+  to:   1.0,
+  beforeStart: function(effect)  
+    { effect.setOpacity(0);
+      Element.show(effect.element); },
+  afterUpdate: function(effect)  
+    { Element.show(effect.element); }
+  }.extend(arguments[1] || {});
+  new Effect.Opacity(element,options);
+}
+
+Effect.Puff = function(element) {
+  new Effect.Parallel(
+   [ new Effect.Scale(element, 200, { sync: true, scaleFromCenter: true }), 
+     new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0 } ) ], 
+     { duration: 1.0, 
+      afterUpdate: function(effect) 
+       { effect.effects[0].element.style.position = 'absolute'; },
+      afterFinish: function(effect)
+       { Element.hide(effect.effects[0].element); }
+     }
+   );
+}
+
+Effect.BlindUp = function(element) {
+  $(element)._overflow = $(element).style.overflow || 'visible';
+  $(element).style.overflow = 'hidden';
+  new Effect.Scale(element, 0, 
+    { scaleContent: false, 
+      scaleX: false, 
+      afterFinish: function(effect) 
+        { 
+          Element.hide(effect.element);
+          effect.element.style.overflow = effect.element._overflow;
+        } 
+    }.extend(arguments[1] || {})
+  );
+}
+
+Effect.BlindDown = function(element) {
+  $(element).style.height   = '0px';
+  $(element)._overflow = $(element).style.overflow || 'visible';
+  $(element).style.overflow = 'hidden';
+  Element.show(element);
+  new Effect.Scale(element, 100, 
+    { scaleContent: false, 
+      scaleX: false, 
+      scaleMode: 'contents',
+      scaleFrom: 0,
+      afterFinish: function(effect) {
+        effect.element.style.overflow = effect.element._overflow;
+      }
+    }.extend(arguments[1] || {})
+  );
+}
+
+Effect.SwitchOff = function(element) {
+  new Effect.Appear(element,
+    { duration: 0.4,
+     transition: Effect.Transitions.flicker,
+     afterFinish: function(effect)
+      {  effect.element.style.overflow = 'hidden';
+        new Effect.Scale(effect.element, 1, 
+         { duration: 0.3, scaleFromCenter: true,
+          scaleX: false, scaleContent: false,
+          afterUpdate: function(effect) { 
+           if(effect.element.style.position=="")
+             effect.element.style.position = 'relative'; },
+          afterFinish: function(effect) { Element.hide(effect.element); }
+         } )
+      }
+    } )
+}
+
+Effect.DropOut = function(element) {
+  new Effect.Parallel(
+    [ new Effect.MoveBy(element, 100, 0, { sync: true }), 
+      new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0 } ) ], 
+    { duration: 0.5, 
+     afterFinish: function(effect)
+       { Element.hide(effect.effects[0].element); } 
+    });
+}
+
+Effect.Shake = function(element) {
+  new Effect.MoveBy(element, 0, 20, 
+    { duration: 0.05, afterFinish: function(effect) {
+  new Effect.MoveBy(effect.element, 0, -40, 
+    { duration: 0.1, afterFinish: function(effect) { 
+  new Effect.MoveBy(effect.element, 0, 40, 
+    { duration: 0.1, afterFinish: function(effect) {  
+  new Effect.MoveBy(effect.element, 0, -40, 
+    { duration: 0.1, afterFinish: function(effect) {  
+  new Effect.MoveBy(effect.element, 0, 40, 
+    { duration: 0.1, afterFinish: function(effect) {  
+  new Effect.MoveBy(effect.element, 0, -20, 
+    { duration: 0.05, afterFinish: function(effect) {  
+  }}) }}) }}) }}) }}) }});
+}
+
+Effect.SlideDown = function(element) {
+  $(element)._overflow = $(element).style.overflow || 'visible';
+  $(element).style.height   = '0px';
+  $(element).style.overflow = 'hidden';
+  $(element).firstChild.style.position = 'relative';
+  Element.show(element);
+  new Effect.Scale(element, 100, 
+   { scaleContent: false, 
+    scaleX: false, 
+    scaleMode: 'contents',
+    scaleFrom: 0,
+    afterUpdate: function(effect) 
+      { effect.element.firstChild.style.bottom = 
+          (effect.originalHeight - effect.element.clientHeight) + 'px'; },
+    afterFinish: function(effect) 
+      {  effect.element.style.overflow = effect.element._overflow; }
+    }.extend(arguments[1] || {})
+  );
+}
+  
+Effect.SlideUp = function(element) {
+  $(element)._overflow = $(element).style.overflow || 'visible';
+  $(element).style.overflow = 'hidden';
+  $(element).firstChild.style.position = 'relative';
+  Element.show(element);
+  new Effect.Scale(element, 0, 
+   { scaleContent: false, 
+    scaleX: false, 
+    afterUpdate: function(effect) 
+      { effect.element.firstChild.style.bottom = 
+          (effect.originalHeight - effect.element.clientHeight) + 'px'; },
+    afterFinish: function(effect)
+      { 
+        Element.hide(effect.element);
+        effect.element.style.overflow = effect.element._overflow; 
+      }
+   }.extend(arguments[1] || {})
+  );
+}
+
+Effect.Squish = function(element) {
+ new Effect.Scale(element, 0, 
+   { afterFinish: function(effect) { Element.hide(effect.element); } });
+}
+
+Effect.Grow = function(element) {
+  element = $(element);
+  var options = arguments[1] || {};
+  
+  var originalWidth = element.clientWidth;
+  var originalHeight = element.clientHeight;
+  element.style.overflow = 'hidden';
+  Element.show(element);
+  
+  var direction = options.direction || 'center';
+  var moveTransition = options.moveTransition || Effect.Transitions.sinoidal;
+  var scaleTransition = options.scaleTransition || Effect.Transitions.sinoidal;
+  var opacityTransition = options.opacityTransition || Effect.Transitions.full;
+  
+  var initialMoveX, initialMoveY;
+  var moveX, moveY;
+  
+  switch (direction) {
+    case 'top-left':
+      initialMoveX = initialMoveY = moveX = moveY = 0; 
+      break;
+    case 'top-right':
+      initialMoveX = originalWidth;
+      initialMoveY = moveY = 0;
+      moveX = -originalWidth;
+      break;
+    case 'bottom-left':
+      initialMoveX = moveX = 0;
+      initialMoveY = originalHeight;
+      moveY = -originalHeight;
+      break;
+    case 'bottom-right':
+      initialMoveX = originalWidth;
+      initialMoveY = originalHeight;
+      moveX = -originalWidth;
+      moveY = -originalHeight;
+      break;
+    case 'center':
+      initialMoveX = originalWidth / 2;
+      initialMoveY = originalHeight / 2;
+      moveX = -originalWidth / 2;
+      moveY = -originalHeight / 2;
+      break;
+  }
+  
+  new Effect.MoveBy(element, initialMoveY, initialMoveX, { 
+    duration: 0.01, 
+    beforeUpdate: function(effect) { $(element).style.height = '0px'; },
+    afterFinish: function(effect) {
+      new Effect.Parallel(
+        [ new Effect.Opacity(element, { sync: true, to: 1.0, from: 0.0, transition: opacityTransition }),
+          new Effect.MoveBy(element, moveY, moveX, { sync: true, transition: moveTransition }),
+          new Effect.Scale(element, 100, { 
+            scaleMode: { originalHeight: originalHeight, originalWidth: originalWidth }, 
+            sync: true, scaleFrom: 0, scaleTo: 100, transition: scaleTransition })],
+        options); }
+    });
+}
+
+Effect.Shrink = function(element) {
+  element = $(element);
+  var options = arguments[1] || {};
+  
+  var originalWidth = element.clientWidth;
+  var originalHeight = element.clientHeight;
+  element.style.overflow = 'hidden';
+  Element.show(element);
+
+  var direction = options.direction || 'center';
+  var moveTransition = options.moveTransition || Effect.Transitions.sinoidal;
+  var scaleTransition = options.scaleTransition || Effect.Transitions.sinoidal;
+  var opacityTransition = options.opacityTransition || Effect.Transitions.none;
+  
+  var moveX, moveY;
+  
+  switch (direction) {
+    case 'top-left':
+      moveX = moveY = 0;
+      break;
+    case 'top-right':
+      moveX = originalWidth;
+      moveY = 0;
+      break;
+    case 'bottom-left':
+      moveX = 0;
+      moveY = originalHeight;
+      break;
+    case 'bottom-right':
+      moveX = originalWidth;
+      moveY = originalHeight;
+      break;
+    case 'center':  
+      moveX = originalWidth / 2;
+      moveY = originalHeight / 2;
+      break;
+  }
+  
+  new Effect.Parallel(
+    [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: opacityTransition }),
+      new Effect.Scale(element, 0, { sync: true, transition: moveTransition }),
+      new Effect.MoveBy(element, moveY, moveX, { sync: true, transition: scaleTransition }) ],
+    options);
+}
+
+Effect.Pulsate = function(element) {
+  var options    = arguments[1] || {};
+  var transition = options.transition || Effect.Transitions.sinoidal;
+  var reverser   = function(pos){ return transition(1-Effect.Transitions.pulse(pos)) };
+  reverser.bind(transition);
+  new Effect.Opacity(element, 
+    {  duration: 3.0,
+       afterFinish: function(effect) { Element.show(effect.element); }
+    }.extend(options).extend({transition: reverser}));
+}
+
+Effect.Fold = function(element) {
+ $(element).style.overflow = 'hidden';
+ new Effect.Scale(element, 5, {   
+   scaleContent: false,
+   scaleTo: 100,
+   scaleX: false,
+   afterFinish: function(effect) {
+   new Effect.Scale(element, 1, { 
+     scaleContent: false, 
+     scaleTo: 0,
+     scaleY: false,
+     afterFinish: function(effect) { Element.hide(effect.element) } });
+ }}.extend(arguments[1] || {}));
+}
+
+// old: new Effect.ContentZoom(element, percent)
+// new: Element.setContentZoom(element, percent) 
+
+Element.setContentZoom = function(element, percent) {
+  var element = $(element);
+  element.style.fontSize = (percent/100) + "em";  
+  if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
+}
diff --git a/railties/html/javascripts/prototype.js b/railties/html/javascripts/prototype.js
new file mode 100644
index 0000000000..5f1ccadb11
--- /dev/null
+++ b/railties/html/javascripts/prototype.js
@@ -0,0 +1,1027 @@
+/*  Prototype JavaScript framework, version 1.3.0
+ *  (c) 2005 Sam Stephenson <sam@conio.net>
+ *
+ *  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
+ *  against the source tree, available from the Prototype darcs repository. 
+ *
+ *  Prototype is freely distributable under the terms of an MIT-style license.
+ *
+ *  For details, see the Prototype web site: http://prototype.conio.net/
+ *
+/*--------------------------------------------------------------------------*/
+
+var Prototype = {
+  Version: '1.3.0',
+  emptyFunction: function() {}
+}
+
+var Class = {
+  create: function() {
+    return function() { 
+      this.initialize.apply(this, arguments);
+    }
+  }
+}
+
+var Abstract = new Object();
+
+Object.extend = function(destination, source) {
+  for (property in source) {
+    destination[property] = source[property];
+  }
+  return destination;
+}
+
+Object.prototype.extend = function(object) {
+  return Object.extend.apply(this, [this, object]);
+}
+
+Function.prototype.bind = function(object) {
+  var __method = this;
+  return function() {
+    __method.apply(object, arguments);
+  }
+}
+
+Function.prototype.bindAsEventListener = function(object) {
+  var __method = this;
+  return function(event) {
+    __method.call(object, event || window.event);
+  }
+}
+
+Number.prototype.toColorPart = function() {
+  var digits = this.toString(16);
+  if (this < 16) return '0' + digits;
+  return digits;
+}
+
+var Try = {
+  these: function() {
+    var returnValue;
+
+    for (var i = 0; i < arguments.length; i++) {
+      var lambda = arguments[i];
+      try {
+        returnValue = lambda();
+        break;
+      } catch (e) {}
+    }
+
+    return returnValue;
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var PeriodicalExecuter = Class.create();
+PeriodicalExecuter.prototype = {
+  initialize: function(callback, frequency) {
+    this.callback = callback;
+    this.frequency = frequency;
+    this.currentlyExecuting = false;
+
+    this.registerCallback();
+  },
+
+  registerCallback: function() {
+    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
+  },
+
+  onTimerEvent: function() {
+    if (!this.currentlyExecuting) {
+      try { 
+        this.currentlyExecuting = true;
+        this.callback(); 
+      } finally { 
+        this.currentlyExecuting = false;
+      }
+    }
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+function $() {
+  var elements = new Array();
+
+  for (var i = 0; i < arguments.length; i++) {
+    var element = arguments[i];
+    if (typeof element == 'string')
+      element = document.getElementById(element);
+
+    if (arguments.length == 1) 
+      return element;
+
+    elements.push(element);
+  }
+
+  return elements;
+}
+
+if (!Array.prototype.push) {
+  Array.prototype.push = function() {
+		var startLength = this.length;
+		for (var i = 0; i < arguments.length; i++)
+      this[startLength + i] = arguments[i];
+	  return this.length;
+  }
+}
+
+if (!Function.prototype.apply) {
+  // Based on code from http://www.youngpup.net/
+  Function.prototype.apply = function(object, parameters) {
+    var parameterStrings = new Array();
+    if (!object)     object = window;
+    if (!parameters) parameters = new Array();
+    
+    for (var i = 0; i < parameters.length; i++)
+      parameterStrings[i] = 'parameters[' + i + ']';
+    
+    object.__apply__ = this;
+    var result = eval('object.__apply__(' + 
+      parameterStrings[i].join(', ') + ')');
+    object.__apply__ = null;
+    
+    return result;
+  }
+}
+
+String.prototype.extend({
+  stripTags: function() {
+    return this.replace(/<\/?[^>]+>/gi, '');
+  },
+
+  escapeHTML: function() {
+    var div = document.createElement('div');
+    var text = document.createTextNode(this);
+    div.appendChild(text);
+    return div.innerHTML;
+  },
+
+  unescapeHTML: function() {
+    var div = document.createElement('div');
+    div.innerHTML = this.stripTags();
+    return div.childNodes[0].nodeValue;
+  }
+});
+
+var Ajax = {
+  getTransport: function() {
+    return Try.these(
+      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
+      function() {return new ActiveXObject('Microsoft.XMLHTTP')},
+      function() {return new XMLHttpRequest()}
+    ) || false;
+  }
+}
+
+Ajax.Base = function() {};
+Ajax.Base.prototype = {
+  setOptions: function(options) {
+    this.options = {
+      method:       'post',
+      asynchronous: true,
+      parameters:   ''
+    }.extend(options || {});
+  },
+
+  responseIsSuccess: function() {
+    return this.transport.status == undefined
+        || this.transport.status == 0 
+        || (this.transport.status >= 200 && this.transport.status < 300);
+  },
+
+  responseIsFailure: function() {
+    return !this.responseIsSuccess();
+  }
+}
+
+Ajax.Request = Class.create();
+Ajax.Request.Events = 
+  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
+
+Ajax.Request.prototype = (new Ajax.Base()).extend({
+  initialize: function(url, options) {
+    this.transport = Ajax.getTransport();
+    this.setOptions(options);
+    this.request(url);
+  },
+
+  request: function(url) {
+    var parameters = this.options.parameters || '';
+    if (parameters.length > 0) parameters += '&_=';
+
+    try {
+      if (this.options.method == 'get')
+        url += '?' + parameters;
+
+      this.transport.open(this.options.method, url,
+        this.options.asynchronous);
+
+      if (this.options.asynchronous) {
+        this.transport.onreadystatechange = this.onStateChange.bind(this);
+        setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
+      }
+
+      this.setRequestHeaders();
+
+      var body = this.options.postBody ? this.options.postBody : parameters;
+      this.transport.send(this.options.method == 'post' ? body : null);
+
+    } catch (e) {
+    }
+  },
+
+  setRequestHeaders: function() {
+    var requestHeaders = 
+      ['X-Requested-With', 'XMLHttpRequest',
+       'X-Prototype-Version', Prototype.Version];
+
+    if (this.options.method == 'post') {
+      requestHeaders.push('Content-type', 
+        'application/x-www-form-urlencoded');
+
+      /* Force "Connection: close" for Mozilla browsers to work around
+       * a bug where XMLHttpReqeuest sends an incorrect Content-length
+       * header. See Mozilla Bugzilla #246651. 
+       */
+      if (this.transport.overrideMimeType)
+        requestHeaders.push('Connection', 'close');
+    }
+
+    if (this.options.requestHeaders)
+      requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
+
+    for (var i = 0; i < requestHeaders.length; i += 2)
+      this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
+  },
+
+  onStateChange: function() {
+    var readyState = this.transport.readyState;
+    if (readyState != 1)
+      this.respondToReadyState(this.transport.readyState);
+  },
+
+  respondToReadyState: function(readyState) {
+    var event = Ajax.Request.Events[readyState];
+
+    if (event == 'Complete' && this.responseIsFailure())
+      (this.options['on' + this.transport.status]
+       || this.options.onFailure
+       || Prototype.emptyFunction)(this.transport);
+
+    (this.options['on' + event] || Prototype.emptyFunction)(this.transport);    
+  }
+});
+
+Ajax.Updater = Class.create();
+Ajax.Updater.ScriptFragment = '(?:<script.*?>)((\n|.)*?)(?:<\/script>)';
+
+Ajax.Updater.prototype.extend(Ajax.Request.prototype).extend({
+  initialize: function(container, url, options) {
+    this.containers = {
+      success: container.success ? $(container.success) : $(container),
+      failure: container.failure ? $(container.failure) :
+        (container.success ? null : $(container))
+    }
+
+    this.transport = Ajax.getTransport();
+    this.setOptions(options);
+
+    var onComplete = this.options.onComplete || Prototype.emptyFunction;
+    this.options.onComplete = (function() {
+      this.updateContent();
+      onComplete(this.transport);      
+    }).bind(this);
+
+    this.request(url);
+  },
+
+  updateContent: function() {
+    var receiver = this.responseIsSuccess() ?
+      this.containers.success : this.containers.failure;
+
+    var match    = new RegExp(Ajax.Updater.ScriptFragment, 'img');
+    var response = this.transport.responseText.replace(match, '');
+    var scripts  = this.transport.responseText.match(match);
+
+    if (receiver) {
+      if (this.options.insertion) {
+        new this.options.insertion(receiver, response);
+      } else {
+        receiver.innerHTML = response;
+      }
+    }
+
+    if (this.responseIsSuccess()) {
+      if (this.onComplete)
+        setTimeout((function() {this.onComplete(
+          this.transport)}).bind(this), 10);
+    }
+
+    if (this.options.evalScripts && scripts) {
+      match = new RegExp(Ajax.Updater.ScriptFragment, 'im');
+      setTimeout((function() {
+        for (var i = 0; i < scripts.length; i++)
+          eval(scripts[i].match(match)[1]);
+      }).bind(this), 10);
+    }
+  }
+});
+
+Ajax.PeriodicalUpdater = Class.create();
+Ajax.PeriodicalUpdater.prototype = (new Ajax.Base()).extend({
+  initialize: function(container, url, options) {
+    this.setOptions(options);
+    this.onComplete = this.options.onComplete;
+
+    this.frequency = (this.options.frequency || 2);
+    this.decay = 1;
+
+    this.updater = {};
+    this.container = container;
+    this.url = url;
+
+    this.start();
+  },
+
+  start: function() {
+    this.options.onComplete = this.updateComplete.bind(this);
+    this.onTimerEvent();
+  },
+
+  stop: function() {
+    this.updater.onComplete = undefined;
+    clearTimeout(this.timer);
+    (this.onComplete || Ajax.emptyFunction).apply(this, arguments);
+  },
+
+  updateComplete: function(request) {
+    if (this.options.decay) {
+      this.decay = (request.responseText == this.lastText ? 
+        this.decay * this.options.decay : 1);
+
+      this.lastText = request.responseText;
+    }
+    this.timer = setTimeout(this.onTimerEvent.bind(this), 
+      this.decay * this.frequency * 1000);
+  },
+
+  onTimerEvent: function() {
+    this.updater = new Ajax.Updater(this.container, this.url, this.options);
+  }
+});
+
+document.getElementsByClassName = function(className) {
+  var children = document.getElementsByTagName('*') || document.all;
+  var elements = new Array();
+  
+  for (var i = 0; i < children.length; i++) {
+    var child = children[i];
+    var classNames = child.className.split(' ');
+    for (var j = 0; j < classNames.length; j++) {
+      if (classNames[j] == className) {
+        elements.push(child);
+        break;
+      }
+    }
+  }
+  
+  return elements;
+}
+
+/*--------------------------------------------------------------------------*/
+
+if (!window.Element) {
+  var Element = new Object();
+}
+
+Object.extend(Element, {
+  toggle: function() {
+    for (var i = 0; i < arguments.length; i++) {
+      var element = $(arguments[i]);
+      element.style.display = 
+        (element.style.display == 'none' ? '' : 'none');
+    }
+  },
+
+  hide: function() {
+    for (var i = 0; i < arguments.length; i++) {
+      var element = $(arguments[i]);
+      element.style.display = 'none';
+    }
+  },
+
+  show: function() {
+    for (var i = 0; i < arguments.length; i++) {
+      var element = $(arguments[i]);
+      element.style.display = '';
+    }
+  },
+
+  remove: function(element) {
+    element = $(element);
+    element.parentNode.removeChild(element);
+  },
+   
+  getHeight: function(element) {
+    element = $(element);
+    return element.offsetHeight; 
+  },
+
+  hasClassName: function(element, className) {
+    element = $(element);
+    if (!element)
+      return;
+    var a = element.className.split(' ');
+    for (var i = 0; i < a.length; i++) {
+      if (a[i] == className)
+        return true;
+    }
+    return false;
+  },
+
+  addClassName: function(element, className) {
+    element = $(element);
+    Element.removeClassName(element, className);
+    element.className += ' ' + className;
+  },
+
+  removeClassName: function(element, className) {
+    element = $(element);
+    if (!element)
+      return;
+    var newClassName = '';
+    var a = element.className.split(' ');
+    for (var i = 0; i < a.length; i++) {
+      if (a[i] != className) {
+        if (i > 0)
+          newClassName += ' ';
+        newClassName += a[i];
+      }
+    }
+    element.className = newClassName;
+  },
+  
+  // removes whitespace-only text node children
+  cleanWhitespace: function(element) {
+    var element = $(element);
+    for (var i = 0; i < element.childNodes.length; i++) {
+      var node = element.childNodes[i];
+      if (node.nodeType == 3 && !/\S/.test(node.nodeValue)) 
+        Element.remove(node);
+    }
+  }
+});
+
+var Toggle = new Object();
+Toggle.display = Element.toggle;
+
+/*--------------------------------------------------------------------------*/
+
+Abstract.Insertion = function(adjacency) {
+  this.adjacency = adjacency;
+}
+
+Abstract.Insertion.prototype = {
+  initialize: function(element, content) {
+    this.element = $(element);
+    this.content = content;
+    
+    if (this.adjacency && this.element.insertAdjacentHTML) {
+      this.element.insertAdjacentHTML(this.adjacency, this.content);
+    } else {
+      this.range = this.element.ownerDocument.createRange();
+      if (this.initializeRange) this.initializeRange();
+      this.fragment = this.range.createContextualFragment(this.content);
+      this.insertContent();
+    }
+  }
+}
+
+var Insertion = new Object();
+
+Insertion.Before = Class.create();
+Insertion.Before.prototype = (new Abstract.Insertion('beforeBegin')).extend({
+  initializeRange: function() {
+    this.range.setStartBefore(this.element);
+  },
+  
+  insertContent: function() {
+    this.element.parentNode.insertBefore(this.fragment, this.element);
+  }
+});
+
+Insertion.Top = Class.create();
+Insertion.Top.prototype = (new Abstract.Insertion('afterBegin')).extend({
+  initializeRange: function() {
+    this.range.selectNodeContents(this.element);
+    this.range.collapse(true);
+  },
+  
+  insertContent: function() {  
+    this.element.insertBefore(this.fragment, this.element.firstChild);
+  }
+});
+
+Insertion.Bottom = Class.create();
+Insertion.Bottom.prototype = (new Abstract.Insertion('beforeEnd')).extend({
+  initializeRange: function() {
+    this.range.selectNodeContents(this.element);
+    this.range.collapse(this.element);
+  },
+  
+  insertContent: function() {
+    this.element.appendChild(this.fragment);
+  }
+});
+
+Insertion.After = Class.create();
+Insertion.After.prototype = (new Abstract.Insertion('afterEnd')).extend({
+  initializeRange: function() {
+    this.range.setStartAfter(this.element);
+  },
+  
+  insertContent: function() {
+    this.element.parentNode.insertBefore(this.fragment, 
+      this.element.nextSibling);
+  }
+});
+
+var Field = {
+  clear: function() {
+    for (var i = 0; i < arguments.length; i++)
+      $(arguments[i]).value = '';
+  },
+
+  focus: function(element) {
+    $(element).focus();
+  },
+  
+  present: function() {
+    for (var i = 0; i < arguments.length; i++)
+      if ($(arguments[i]).value == '') return false;
+    return true;
+  },
+  
+  select: function(element) {
+    $(element).select();
+  },
+   
+  activate: function(element) {
+    $(element).focus();
+    $(element).select();
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var Form = {
+  serialize: function(form) {
+    var elements = Form.getElements($(form));
+    var queryComponents = new Array();
+    
+    for (var i = 0; i < elements.length; i++) {
+      var queryComponent = Form.Element.serialize(elements[i]);
+      if (queryComponent)
+        queryComponents.push(queryComponent);
+    }
+    
+    return queryComponents.join('&');
+  },
+  
+  getElements: function(form) {
+    var form = $(form);
+    var elements = new Array();
+
+    for (tagName in Form.Element.Serializers) {
+      var tagElements = form.getElementsByTagName(tagName);
+      for (var j = 0; j < tagElements.length; j++)
+        elements.push(tagElements[j]);
+    }
+    return elements;
+  },
+  
+  getInputs: function(form, typeName, name) {
+    var form = $(form);
+    var inputs = form.getElementsByTagName('input');
+    
+    if (!typeName && !name)
+      return inputs;
+      
+    var matchingInputs = new Array();
+    for (var i = 0; i < inputs.length; i++) {
+      var input = inputs[i];
+      if ((typeName && input.type != typeName) ||
+          (name && input.name != name)) 
+        continue;
+      matchingInputs.push(input);
+    }
+
+    return matchingInputs;
+  },
+
+  disable: function(form) {
+    var elements = Form.getElements(form);
+    for (var i = 0; i < elements.length; i++) {
+      var element = elements[i];
+      element.blur();
+      element.disabled = 'true';
+    }
+  },
+
+  enable: function(form) {
+    var elements = Form.getElements(form);
+    for (var i = 0; i < elements.length; i++) {
+      var element = elements[i];
+      element.disabled = '';
+    }
+  },
+
+  focusFirstElement: function(form) {
+    var form = $(form);
+    var elements = Form.getElements(form);
+    for (var i = 0; i < elements.length; i++) {
+      var element = elements[i];
+      if (element.type != 'hidden' && !element.disabled) {
+        Field.activate(element);
+        break;
+      }
+    }
+  },
+
+  reset: function(form) {
+    $(form).reset();
+  }
+}
+
+Form.Element = {
+  serialize: function(element) {
+    var element = $(element);
+    var method = element.tagName.toLowerCase();
+    var parameter = Form.Element.Serializers[method](element);
+    
+    if (parameter)
+      return encodeURIComponent(parameter[0]) + '=' + 
+        encodeURIComponent(parameter[1]);                   
+  },
+  
+  getValue: function(element) {
+    var element = $(element);
+    var method = element.tagName.toLowerCase();
+    var parameter = Form.Element.Serializers[method](element);
+    
+    if (parameter) 
+      return parameter[1];
+  }
+}
+
+Form.Element.Serializers = {
+  input: function(element) {
+    switch (element.type.toLowerCase()) {
+      case 'submit':
+      case 'hidden':
+      case 'password':
+      case 'text':
+        return Form.Element.Serializers.textarea(element);
+      case 'checkbox':  
+      case 'radio':
+        return Form.Element.Serializers.inputSelector(element);
+    }
+    return false;
+  },
+
+  inputSelector: function(element) {
+    if (element.checked)
+      return [element.name, element.value];
+  },
+
+  textarea: function(element) {
+    return [element.name, element.value];
+  },
+
+  select: function(element) {
+    var value = '';
+    if (element.type == 'select-one') {
+      var index = element.selectedIndex;
+      if (index >= 0)
+        value = element.options[index].value || element.options[index].text;
+    } else {
+      value = new Array();
+      for (var i = 0; i < element.length; i++) {
+        var opt = element.options[i];
+        if (opt.selected)
+          value.push(opt.value || opt.text);
+      }
+    }
+    return [element.name, value];
+  }
+}
+
+/*--------------------------------------------------------------------------*/
+
+var $F = Form.Element.getValue;
+
+/*--------------------------------------------------------------------------*/
+
+Abstract.TimedObserver = function() {}
+Abstract.TimedObserver.prototype = {
+  initialize: function(element, frequency, callback) {
+    this.frequency = frequency;
+    this.element   = $(element);
+    this.callback  = callback;
+    
+    this.lastValue = this.getValue();
+    this.registerCallback();
+  },
+  
+  registerCallback: function() {
+    setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
+  },
+  
+  onTimerEvent: function() {
+    var value = this.getValue();
+    if (this.lastValue != value) {
+      this.callback(this.element, value);
+      this.lastValue = value;
+    }
+  }
+}
+
+Form.Element.Observer = Class.create();
+Form.Element.Observer.prototype = (new Abstract.TimedObserver()).extend({
+  getValue: function() {
+    return Form.Element.getValue(this.element);
+  }
+});
+
+Form.Observer = Class.create();
+Form.Observer.prototype = (new Abstract.TimedObserver()).extend({
+  getValue: function() {
+    return Form.serialize(this.element);
+  }
+});
+
+/*--------------------------------------------------------------------------*/
+
+Abstract.EventObserver = function() {}
+Abstract.EventObserver.prototype = {
+  initialize: function(element, callback) {
+    this.element  = $(element);
+    this.callback = callback;
+    
+    this.lastValue = this.getValue();
+    if (this.element.tagName.toLowerCase() == 'form')
+      this.registerFormCallbacks();
+    else
+      this.registerCallback(this.element);
+  },
+  
+  onElementEvent: function() {
+    var value = this.getValue();
+    if (this.lastValue != value) {
+      this.callback(this.element, value);
+      this.lastValue = value;
+    }
+  },
+  
+  registerFormCallbacks: function() {
+    var elements = Form.getElements(this.element);
+    for (var i = 0; i < elements.length; i++)
+      this.registerCallback(elements[i]);
+  },
+  
+  registerCallback: function(element) {
+    if (element.type) {
+      switch (element.type.toLowerCase()) {
+        case 'checkbox':  
+        case 'radio':
+          element.target = this;
+          element.prev_onclick = element.onclick || Prototype.emptyFunction;
+          element.onclick = function() {
+            this.prev_onclick(); 
+            this.target.onElementEvent();
+          }
+          break;
+        case 'password':
+        case 'text':
+        case 'textarea':
+        case 'select-one':
+        case 'select-multiple':
+          element.target = this;
+          element.prev_onchange = element.onchange || Prototype.emptyFunction;
+          element.onchange = function() {
+            this.prev_onchange(); 
+            this.target.onElementEvent();
+          }
+          break;
+      }
+    }    
+  }
+}
+
+Form.Element.EventObserver = Class.create();
+Form.Element.EventObserver.prototype = (new Abstract.EventObserver()).extend({
+  getValue: function() {
+    return Form.Element.getValue(this.element);
+  }
+});
+
+Form.EventObserver = Class.create();
+Form.EventObserver.prototype = (new Abstract.EventObserver()).extend({
+  getValue: function() {
+    return Form.serialize(this.element);
+  }
+});
+
+
+if (!window.Event) {
+  var Event = new Object();
+}
+
+Object.extend(Event, {
+  KEY_BACKSPACE: 8,
+  KEY_TAB:       9,
+  KEY_RETURN:   13,
+  KEY_ESC:      27,
+  KEY_LEFT:     37,
+  KEY_UP:       38,
+  KEY_RIGHT:    39,
+  KEY_DOWN:     40,
+  KEY_DELETE:   46,
+
+  element: function(event) {
+    return event.target || event.srcElement;
+  },
+
+  isLeftClick: function(event) {
+    return (((event.which) && (event.which == 1)) ||
+            ((event.button) && (event.button == 1)));
+  },
+
+  pointerX: function(event) {
+    return event.pageX || (event.clientX + 
+      (document.documentElement.scrollLeft || document.body.scrollLeft));
+  },
+
+  pointerY: function(event) {
+    return event.pageY || (event.clientY + 
+      (document.documentElement.scrollTop || document.body.scrollTop));
+  },
+
+  stop: function(event) {
+    if (event.preventDefault) { 
+      event.preventDefault(); 
+      event.stopPropagation(); 
+    } else {
+      event.returnValue = false;
+    }
+  },
+
+  // find the first node with the given tagName, starting from the
+  // node the event was triggered on; traverses the DOM upwards
+  findElement: function(event, tagName) {
+    var element = Event.element(event);
+    while (element.parentNode && (!element.tagName ||
+        (element.tagName.toUpperCase() != tagName.toUpperCase())))
+      element = element.parentNode;
+    return element;
+  },
+
+  observe: function(element, name, observer, useCapture) {
+    var element = $(element);
+    useCapture = useCapture || false;
+    
+    if (name == 'keypress') {
+      if (navigator.appVersion.indexOf('AppleWebKit') > 0) {
+        element.addEventListener('keydown', observer, useCapture);
+        return;
+      }
+      if (element.addEventListener) {
+        element.addEventListener('keypress', observer, useCapture);
+      } else if (element.attachEvent) {
+        element.attachEvent('onkeydown', observer);
+      }
+    } else {
+      if (element.addEventListener) {
+        element.addEventListener(name, observer, useCapture);
+      } else if (element.attachEvent) {
+        element.attachEvent('on' + name, observer);
+      }
+    }
+  },
+
+  stopObserving: function(element, name, observer, useCapture) {
+    var element = $(element);
+    useCapture = useCapture || false;
+    
+    if (name == 'keypress') {
+      if (navigator.appVersion.indexOf('AppleWebKit') > 0) {
+        element.removeEventListener('keydown', observer, useCapture);
+        return;
+      }
+      if (element.removeEventListener) {
+        element.removeEventListener('keypress', observer, useCapture);
+      } else if (element.detachEvent) {
+        element.detachEvent('onkeydown', observer);
+      }
+    } else {
+      if (element.removeEventListener) {
+        element.removeEventListener(name, observer, useCapture);
+      } else if (element.detachEvent) {
+        element.detachEvent('on' + name, observer);
+      }
+    }
+  }
+});
+
+var Position = {
+
+  // set to true if needed, warning: firefox performance problems
+  // NOT neeeded for page scrolling, only if draggable contained in
+  // scrollable elements
+  includeScrollOffsets: false, 
+
+  // must be called before calling withinIncludingScrolloffset, every time the
+  // page is scrolled
+  prepare: function() {
+    this.deltaX =  window.pageXOffset 
+                || document.documentElement.scrollLeft 
+                || document.body.scrollLeft 
+                || 0;
+    this.deltaY =  window.pageYOffset 
+                || document.documentElement.scrollTop 
+                || document.body.scrollTop 
+                || 0;
+  },
+
+  realOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.scrollTop  || 0;
+      valueL += element.scrollLeft || 0; 
+      element = element.parentNode;
+    } while (element);
+    return [valueL, valueT];
+  },
+
+  cumulativeOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      element = element.offsetParent;
+    } while (element);
+    return [valueL, valueT];
+  },
+
+  // caches x/y coordinate pair to use with overlap
+  within: function(element, x, y) {
+    if (this.includeScrollOffsets)
+      return this.withinIncludingScrolloffsets(element, x, y);
+    this.xcomp = x;
+    this.ycomp = y;
+    this.offset = this.cumulativeOffset(element);
+
+    return (y >= this.offset[1] &&
+            y <  this.offset[1] + element.offsetHeight &&
+            x >= this.offset[0] && 
+            x <  this.offset[0] + element.offsetWidth);
+  },
+
+  withinIncludingScrolloffsets: function(element, x, y) {
+    var offsetcache = this.realOffset(element);
+
+    this.xcomp = x + offsetcache[0] - this.deltaX;
+    this.ycomp = y + offsetcache[1] - this.deltaY;
+    this.offset = this.cumulativeOffset(element);
+
+    return (this.ycomp >= this.offset[1] &&
+            this.ycomp <  this.offset[1] + element.offsetHeight &&
+            this.xcomp >= this.offset[0] && 
+            this.xcomp <  this.offset[0] + element.offsetWidth);
+  },
+
+  // within must be called directly before
+  overlap: function(mode, element) {  
+    if (!mode) return 0;  
+    if (mode == 'vertical') 
+      return ((this.offset[1] + element.offsetHeight) - this.ycomp) / 
+        element.offsetHeight;
+    if (mode == 'horizontal')
+      return ((this.offset[0] + element.offsetWidth) - this.xcomp) / 
+        element.offsetWidth;
+  },
+
+  clone: function(source, target) {
+    source = $(source);
+    target = $(target);
+    target.style.position = 'absolute';
+    var offsets = this.cumulativeOffset(source);
+    target.style.top    = offsets[1] + 'px';
+    target.style.left   = offsets[0] + 'px';
+    target.style.width  = source.offsetWidth + 'px';
+    target.style.height = source.offsetHeight + 'px';
+  }
+}