diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index 4e5cea8fb9..163ac77ec2 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Update to latest script.aculo.us version (as of [3031])
+
 * Updated docs for in_place_editor, fixes a couple bugs and offers extended support for external controls [Justin Palmer]
 
 * Update documentation for render :file.  #2858 [Tom Werner]
diff --git a/actionpack/lib/action_view/helpers/javascripts/controls.js b/actionpack/lib/action_view/helpers/javascripts/controls.js
index 6da588543b..9742b69188 100644
--- a/actionpack/lib/action_view/helpers/javascripts/controls.js
+++ b/actionpack/lib/action_view/helpers/javascripts/controls.js
@@ -80,7 +80,10 @@ Autocompleter.Base.prototype = {
 
   show: function() {
     if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
-    if(!this.iefix && (navigator.appVersion.indexOf('MSIE')>0) && (Element.getStyle(this.update, 'position')=='absolute')) {
+    if(!this.iefix && 
+      (navigator.appVersion.indexOf('MSIE')>0) &&
+      (navigator.userAgent.indexOf('Opera')<0) &&
+      (Element.getStyle(this.update, 'position')=='absolute')) {
       new Insertion.After(this.update, 
        '<iframe id="' + this.update.id + '_iefix" '+
        'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
@@ -718,4 +721,30 @@ Ajax.InPlaceEditor.prototype = {
       Event.stopObserving(this.options.externalControl, 'mouseout', this.mouseoutListener);
     }
   }
+};
+
+// Delayed observer, like Form.Element.Observer, 
+// but waits for delay after last key input
+// Ideal for live-search fields
+
+Form.Element.DelayedObserver = Class.create();
+Form.Element.DelayedObserver.prototype = {
+  initialize: function(element, delay, callback) {
+    this.delay     = delay || 0.5;
+    this.element   = $(element);
+    this.callback  = callback;
+    this.timer     = null;
+    this.lastValue = $F(this.element); 
+    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
+  },
+  delayedListener: function(event) {
+    if(this.lastValue == $F(this.element)) return;
+    if(this.timer) clearTimeout(this.timer);
+    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
+    this.lastValue = $F(this.element);
+  },
+  onTimerEvent: function() {
+    this.timer = null;
+    this.callback(this.element, $F(this.element));
+  }
 };
\ No newline at end of file
diff --git a/actionpack/lib/action_view/helpers/javascripts/dragdrop.js b/actionpack/lib/action_view/helpers/javascripts/dragdrop.js
index 63a68243b6..326700782e 100644
--- a/actionpack/lib/action_view/helpers/javascripts/dragdrop.js
+++ b/actionpack/lib/action_view/helpers/javascripts/dragdrop.js
@@ -1,7 +1,5 @@
 // Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
 // 
-// Element.Class part Copyright (c) 2005 by Rick Olson
-// 
 // See scriptaculous.js for full license.
 
 /*--------------------------------------------------------------------------*/
@@ -31,6 +29,8 @@ var Droppables = {
         options._containers.push($(containment));
       }
     }
+    
+    if(options.accept) options.accept = [options.accept].flatten();
 
     Element.makePositioned(element); // fix IE
     options.element = element;
@@ -49,20 +49,21 @@ var Droppables = {
       ((!drop._containers) ||
         this.isContained(element, drop)) &&
       ((!drop.accept) ||
-        (Element.Class.has_any(element, drop.accept))) &&
+        (Element.classNames(element).detect( 
+          function(v) { return drop.accept.include(v) } ) )) &&
       Position.within(drop.element, pX, pY) );
   },
 
   deactivate: function(drop) {
     if(drop.hoverclass)
-      Element.Class.remove(drop.element, drop.hoverclass);
+      Element.removeClassName(drop.element, drop.hoverclass);
     this.last_active = null;
   },
 
   activate: function(drop) {
     if(this.last_active) this.deactivate(this.last_active);
     if(drop.hoverclass)
-      Element.Class.add(drop.element, drop.hoverclass);
+      Element.addClassName(drop.element, drop.hoverclass);
     this.last_active = drop;
   },
 
@@ -105,13 +106,25 @@ var Droppables = {
 var Draggables = {
   observers: [],
   addObserver: function(observer) {
-    this.observers.push(observer);    
+    this.observers.push(observer);
+    this._cacheObserverCallbacks();
   },
-  removeObserver: function(element) {  // element instead of obsever fixes mem leaks
+  removeObserver: function(element) {  // element instead of observer fixes mem leaks
     this.observers = this.observers.reject( function(o) { return o.element==element });
+    this._cacheObserverCallbacks();
   },
-  notify: function(eventName, draggable) {  // 'onStart', 'onEnd'
-    this.observers.invoke(eventName, draggable);
+  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
+    if(this[eventName+'Count'] > 0)
+      this.observers.each( function(o) {
+        if(o[eventName]) o[eventName](eventName, draggable, event);
+      });
+  },
+  _cacheObserverCallbacks: function() {
+    ['onStart','onEnd','onDrag'].each( function(eventName) {
+      Draggables[eventName+'Count'] = Draggables.observers.select(
+        function(o) { return o[eventName]; }
+      ).length;
+    });
   }
 }
 
@@ -138,7 +151,7 @@ Draggable.prototype = {
 
     this.element      = $(element);
     if(options.handle && (typeof options.handle == 'string'))
-      this.handle = Element.Class.childrenWith(this.element, options.handle)[0];
+      this.handle = Element.childrenWithClassName(this.element, options.handle)[0];
       
     if(!this.handle) this.handle = $(options.handle);
     if(!this.handle) this.handle = this.element;
@@ -219,7 +232,7 @@ Draggable.prototype = {
     }
 
     if(success) Droppables.fire(event, this.element);
-    Draggables.notify('onEnd', this);
+    Draggables.notify('onEnd', this, event);
 
     var revert = this.options.revert;
     if(revert && typeof revert == 'function') revert = revert(this.element);
@@ -290,11 +303,12 @@ Draggable.prototype = {
           this.element.parentNode.insertBefore(this._clone, this.element);
         }
 
-        Draggables.notify('onStart', this);
+        Draggables.notify('onStart', this, event);
         if(this.options.starteffect) this.options.starteffect(this.element);
       }
 
       Droppables.show(event, this.element);
+      Draggables.notify('onDrag', this, event);
       this.draw(event);
       if(this.options.change) this.options.change(this);
 
@@ -413,7 +427,7 @@ var Sortable = {
     (this.findElements(element, options) || []).each( function(e) {
       // handles are per-draggable
       var handle = options.handle ? 
-        Element.Class.childrenWith(e, options.handle)[0] : e;    
+        Element.childrenWithClassName(e, options.handle)[0] : e;    
       options.draggables.push(
         new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
       Droppables.add(e, options_for_droppable);
@@ -434,7 +448,7 @@ var Sortable = {
     var elements = [];
     $A(element.childNodes).each( function(e) {
       if(e.tagName && e.tagName==options.tag.toUpperCase() &&
-        (!options.only || (Element.Class.has(e, options.only))))
+        (!options.only || (Element.hasClassName(e, options.only))))
           elements.push(e);
       if(options.tree) {
         var grandchildren = this.findElements(e, options);
@@ -491,14 +505,20 @@ var Sortable = {
     if(!Sortable._marker) {
       Sortable._marker = $('dropmarker') || document.createElement('DIV');
       Element.hide(Sortable._marker);
-      Element.Class.add(Sortable._marker, 'dropmarker');
+      Element.addClassName(Sortable._marker, 'dropmarker');
       Sortable._marker.style.position = 'absolute';
       document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
     }    
     var offsets = Position.cumulativeOffset(dropon);
-    Sortable._marker.style.top  = offsets[1] + 'px';
-    if(position=='after') Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
     Sortable._marker.style.left = offsets[0] + 'px';
+    Sortable._marker.style.top = offsets[1] + 'px';
+    
+    if(position=='after')
+      if(sortable.overlap == 'horizontal') 
+        Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';
+      else
+        Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
+    
     Element.show(Sortable._marker);
   },
 
diff --git a/actionpack/lib/action_view/helpers/javascripts/effects.js b/actionpack/lib/action_view/helpers/javascripts/effects.js
index 3f92992065..6a14d24b97 100644
--- a/actionpack/lib/action_view/helpers/javascripts/effects.js
+++ b/actionpack/lib/action_view/helpers/javascripts/effects.js
@@ -86,97 +86,9 @@ Element.setInlineOpacity = function(element, value){
   els.opacity = value;  
 }  
  
-/*--------------------------------------------------------------------------*/  
- 
-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) {  
-      return $(element).className.split(' ');  
-    },  
- 
-    // functions adapted from original functions by Gavin Kistner  
-    remove: function(element) {  
-      element = $(element);  
-      var removeClasses = arguments;  
-      $R(1,arguments.length-1).each( function(index) {  
-        element.className =  
-          element.className.split(' ').reject(  
-            function(klass) { return (klass == removeClasses[index]) } ).join(' ');  
-      });  
-    },  
- 
-    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 = $(element);  
-      if(!element || !element.className) return false;  
-      var regEx;  
-      for(var i = 1; i < arguments.length; i++) {  
-        if((typeof arguments[i] == 'object') &&  
-          (arguments[i].constructor == Array)) {  
-          for(var j = 0; j < arguments[i].length; j++) {  
-            regEx = new RegExp("(^|\\s)" + arguments[i][j] + "(\\s|$)");  
-            if(!regEx.test(element.className)) return false;  
-          }  
-        } else {  
-          regEx = new RegExp("(^|\\s)" + arguments[i] + "(\\s|$)");  
-          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 = $(element);  
-      if(!element || !element.className) return false;  
-      var regEx;  
-      for(var i = 1; i < arguments.length; i++) {  
-        if((typeof arguments[i] == 'object') &&  
-          (arguments[i].constructor == Array)) {  
-          for(var j = 0; j < arguments[i].length; j++) {  
-            regEx = new RegExp("(^|\\s)" + arguments[i][j] + "(\\s|$)");  
-            if(regEx.test(element.className)) return true;  
-          }  
-        } else {  
-          regEx = new RegExp("(^|\\s)" + arguments[i] + "(\\s|$)");  
-          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]);  
- 
-      return elements;  
-    }  
+Element.childrenWithClassName = function(element, className) {  
+  return $A($(element).getElementsByTagName('*')).select(
+    function(c) { return Element.hasClassName(c, className) });
 }  
  
 /*--------------------------------------------------------------------------*/
diff --git a/railties/CHANGELOG b/railties/CHANGELOG
index 297058acf4..b3e274505c 100644
--- a/railties/CHANGELOG
+++ b/railties/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Update to latest script.aculo.us version (as of [3031])
+
 * Eliminate Subversion dependencies in scripts/plugin.  Correct install options.  Introduce --force option to reinstall a plugin.  Remove useless --long option for list.  Use --quiet to quiet the download output and --revision to update to a specific svn revision.  #2842 [Chad Fowler, Rick Olson]
 
 * SQLite: the clone_structure_to_test and purge_test_database Rake tasks should always use the test environment.  #2846 [Rick Olson]
diff --git a/railties/html/javascripts/controls.js b/railties/html/javascripts/controls.js
index 6da588543b..9742b69188 100644
--- a/railties/html/javascripts/controls.js
+++ b/railties/html/javascripts/controls.js
@@ -80,7 +80,10 @@ Autocompleter.Base.prototype = {
 
   show: function() {
     if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
-    if(!this.iefix && (navigator.appVersion.indexOf('MSIE')>0) && (Element.getStyle(this.update, 'position')=='absolute')) {
+    if(!this.iefix && 
+      (navigator.appVersion.indexOf('MSIE')>0) &&
+      (navigator.userAgent.indexOf('Opera')<0) &&
+      (Element.getStyle(this.update, 'position')=='absolute')) {
       new Insertion.After(this.update, 
        '<iframe id="' + this.update.id + '_iefix" '+
        'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
@@ -718,4 +721,30 @@ Ajax.InPlaceEditor.prototype = {
       Event.stopObserving(this.options.externalControl, 'mouseout', this.mouseoutListener);
     }
   }
+};
+
+// Delayed observer, like Form.Element.Observer, 
+// but waits for delay after last key input
+// Ideal for live-search fields
+
+Form.Element.DelayedObserver = Class.create();
+Form.Element.DelayedObserver.prototype = {
+  initialize: function(element, delay, callback) {
+    this.delay     = delay || 0.5;
+    this.element   = $(element);
+    this.callback  = callback;
+    this.timer     = null;
+    this.lastValue = $F(this.element); 
+    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
+  },
+  delayedListener: function(event) {
+    if(this.lastValue == $F(this.element)) return;
+    if(this.timer) clearTimeout(this.timer);
+    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
+    this.lastValue = $F(this.element);
+  },
+  onTimerEvent: function() {
+    this.timer = null;
+    this.callback(this.element, $F(this.element));
+  }
 };
\ No newline at end of file
diff --git a/railties/html/javascripts/dragdrop.js b/railties/html/javascripts/dragdrop.js
index 63a68243b6..326700782e 100644
--- a/railties/html/javascripts/dragdrop.js
+++ b/railties/html/javascripts/dragdrop.js
@@ -1,7 +1,5 @@
 // Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
 // 
-// Element.Class part Copyright (c) 2005 by Rick Olson
-// 
 // See scriptaculous.js for full license.
 
 /*--------------------------------------------------------------------------*/
@@ -31,6 +29,8 @@ var Droppables = {
         options._containers.push($(containment));
       }
     }
+    
+    if(options.accept) options.accept = [options.accept].flatten();
 
     Element.makePositioned(element); // fix IE
     options.element = element;
@@ -49,20 +49,21 @@ var Droppables = {
       ((!drop._containers) ||
         this.isContained(element, drop)) &&
       ((!drop.accept) ||
-        (Element.Class.has_any(element, drop.accept))) &&
+        (Element.classNames(element).detect( 
+          function(v) { return drop.accept.include(v) } ) )) &&
       Position.within(drop.element, pX, pY) );
   },
 
   deactivate: function(drop) {
     if(drop.hoverclass)
-      Element.Class.remove(drop.element, drop.hoverclass);
+      Element.removeClassName(drop.element, drop.hoverclass);
     this.last_active = null;
   },
 
   activate: function(drop) {
     if(this.last_active) this.deactivate(this.last_active);
     if(drop.hoverclass)
-      Element.Class.add(drop.element, drop.hoverclass);
+      Element.addClassName(drop.element, drop.hoverclass);
     this.last_active = drop;
   },
 
@@ -105,13 +106,25 @@ var Droppables = {
 var Draggables = {
   observers: [],
   addObserver: function(observer) {
-    this.observers.push(observer);    
+    this.observers.push(observer);
+    this._cacheObserverCallbacks();
   },
-  removeObserver: function(element) {  // element instead of obsever fixes mem leaks
+  removeObserver: function(element) {  // element instead of observer fixes mem leaks
     this.observers = this.observers.reject( function(o) { return o.element==element });
+    this._cacheObserverCallbacks();
   },
-  notify: function(eventName, draggable) {  // 'onStart', 'onEnd'
-    this.observers.invoke(eventName, draggable);
+  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
+    if(this[eventName+'Count'] > 0)
+      this.observers.each( function(o) {
+        if(o[eventName]) o[eventName](eventName, draggable, event);
+      });
+  },
+  _cacheObserverCallbacks: function() {
+    ['onStart','onEnd','onDrag'].each( function(eventName) {
+      Draggables[eventName+'Count'] = Draggables.observers.select(
+        function(o) { return o[eventName]; }
+      ).length;
+    });
   }
 }
 
@@ -138,7 +151,7 @@ Draggable.prototype = {
 
     this.element      = $(element);
     if(options.handle && (typeof options.handle == 'string'))
-      this.handle = Element.Class.childrenWith(this.element, options.handle)[0];
+      this.handle = Element.childrenWithClassName(this.element, options.handle)[0];
       
     if(!this.handle) this.handle = $(options.handle);
     if(!this.handle) this.handle = this.element;
@@ -219,7 +232,7 @@ Draggable.prototype = {
     }
 
     if(success) Droppables.fire(event, this.element);
-    Draggables.notify('onEnd', this);
+    Draggables.notify('onEnd', this, event);
 
     var revert = this.options.revert;
     if(revert && typeof revert == 'function') revert = revert(this.element);
@@ -290,11 +303,12 @@ Draggable.prototype = {
           this.element.parentNode.insertBefore(this._clone, this.element);
         }
 
-        Draggables.notify('onStart', this);
+        Draggables.notify('onStart', this, event);
         if(this.options.starteffect) this.options.starteffect(this.element);
       }
 
       Droppables.show(event, this.element);
+      Draggables.notify('onDrag', this, event);
       this.draw(event);
       if(this.options.change) this.options.change(this);
 
@@ -413,7 +427,7 @@ var Sortable = {
     (this.findElements(element, options) || []).each( function(e) {
       // handles are per-draggable
       var handle = options.handle ? 
-        Element.Class.childrenWith(e, options.handle)[0] : e;    
+        Element.childrenWithClassName(e, options.handle)[0] : e;    
       options.draggables.push(
         new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
       Droppables.add(e, options_for_droppable);
@@ -434,7 +448,7 @@ var Sortable = {
     var elements = [];
     $A(element.childNodes).each( function(e) {
       if(e.tagName && e.tagName==options.tag.toUpperCase() &&
-        (!options.only || (Element.Class.has(e, options.only))))
+        (!options.only || (Element.hasClassName(e, options.only))))
           elements.push(e);
       if(options.tree) {
         var grandchildren = this.findElements(e, options);
@@ -491,14 +505,20 @@ var Sortable = {
     if(!Sortable._marker) {
       Sortable._marker = $('dropmarker') || document.createElement('DIV');
       Element.hide(Sortable._marker);
-      Element.Class.add(Sortable._marker, 'dropmarker');
+      Element.addClassName(Sortable._marker, 'dropmarker');
       Sortable._marker.style.position = 'absolute';
       document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
     }    
     var offsets = Position.cumulativeOffset(dropon);
-    Sortable._marker.style.top  = offsets[1] + 'px';
-    if(position=='after') Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
     Sortable._marker.style.left = offsets[0] + 'px';
+    Sortable._marker.style.top = offsets[1] + 'px';
+    
+    if(position=='after')
+      if(sortable.overlap == 'horizontal') 
+        Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';
+      else
+        Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
+    
     Element.show(Sortable._marker);
   },
 
diff --git a/railties/html/javascripts/effects.js b/railties/html/javascripts/effects.js
index 3f92992065..6a14d24b97 100644
--- a/railties/html/javascripts/effects.js
+++ b/railties/html/javascripts/effects.js
@@ -86,97 +86,9 @@ Element.setInlineOpacity = function(element, value){
   els.opacity = value;  
 }  
  
-/*--------------------------------------------------------------------------*/  
- 
-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) {  
-      return $(element).className.split(' ');  
-    },  
- 
-    // functions adapted from original functions by Gavin Kistner  
-    remove: function(element) {  
-      element = $(element);  
-      var removeClasses = arguments;  
-      $R(1,arguments.length-1).each( function(index) {  
-        element.className =  
-          element.className.split(' ').reject(  
-            function(klass) { return (klass == removeClasses[index]) } ).join(' ');  
-      });  
-    },  
- 
-    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 = $(element);  
-      if(!element || !element.className) return false;  
-      var regEx;  
-      for(var i = 1; i < arguments.length; i++) {  
-        if((typeof arguments[i] == 'object') &&  
-          (arguments[i].constructor == Array)) {  
-          for(var j = 0; j < arguments[i].length; j++) {  
-            regEx = new RegExp("(^|\\s)" + arguments[i][j] + "(\\s|$)");  
-            if(!regEx.test(element.className)) return false;  
-          }  
-        } else {  
-          regEx = new RegExp("(^|\\s)" + arguments[i] + "(\\s|$)");  
-          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 = $(element);  
-      if(!element || !element.className) return false;  
-      var regEx;  
-      for(var i = 1; i < arguments.length; i++) {  
-        if((typeof arguments[i] == 'object') &&  
-          (arguments[i].constructor == Array)) {  
-          for(var j = 0; j < arguments[i].length; j++) {  
-            regEx = new RegExp("(^|\\s)" + arguments[i][j] + "(\\s|$)");  
-            if(regEx.test(element.className)) return true;  
-          }  
-        } else {  
-          regEx = new RegExp("(^|\\s)" + arguments[i] + "(\\s|$)");  
-          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]);  
- 
-      return elements;  
-    }  
+Element.childrenWithClassName = function(element, className) {  
+  return $A($(element).getElementsByTagName('*')).select(
+    function(c) { return Element.hasClassName(c, className) });
 }  
  
 /*--------------------------------------------------------------------------*/