Added even more goodies to script.aculo.us #1677 [Thomas Fuchs]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1783 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

5 files changed, 273 insertions, 150 deletions

diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index 0dbe5b8748..24877297f7 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,12 @@
 *SVN*
 
+* Added even more goodies to script.aculo.us #1677 [Thomas Fuchs]
+  * Added capability to remove draggables/droppables and redeclare sortables in dragdrop.js (this makes it possible to call sortable_element on the same element more than once, e.g. in AJAX returns that modify the sortable element. all current sortable 'stuff' on the element will be discarded and the sortable will be rebuilt)
+  * Always reset background color on Effect.Highlight; this make change backwards-compatibility, to be sure include style="background-color:(target-color)" on your elements or else elements will fall back to their CSS rules (which is a good thing in most circumstances)
+  * Removed circular references from element to prevent memory leaks (still not completely gone in IE)
+  * Changes to class extension in effects.js
+  * Make Effect.Highlight restore any previously set background color when finishing (makes effect work with CSS classes that set a background color)
+
 * Improved error message for DoubleRenderError
 
 * Fixed routing to allow for testing of *path components #1650 [Nicholas Seckar]
diff --git a/actionpack/lib/action_view/helpers/javascripts/dragdrop.js b/actionpack/lib/action_view/helpers/javascripts/dragdrop.js
index eb6511095f..2bf84f1cb1 100644
--- a/actionpack/lib/action_view/helpers/javascripts/dragdrop.js
+++ b/actionpack/lib/action_view/helpers/javascripts/dragdrop.js
@@ -112,6 +112,12 @@ Element.Class = {
 var Droppables = {
   drops: false,
   
+  remove: function(element) {
+    for(var i = 0; i < this.drops.length; i++)
+      if(this.drops[i].element == element)
+        this.drops.splice(i,1);
+  },
+  
   add: function(element) {
     var element = $(element);
     var options = {
@@ -134,43 +140,42 @@ var Droppables = {
         options._containers.length-1;
     }
     
-    if(element.style.position=='') //fix IE
-      element.style.position = 'relative'; 
+    Element.makePositioned(element); // fix IE
     
-    // activate the droppable
-    element.droppable = options;
+    options.element = element;
     
+    // activate the droppable    
     if(!this.drops) this.drops = [];
-    this.drops.push(element);
+    this.drops.push(options);
   },
   
   is_contained: function(element, drop) {
-    var containers = drop.droppable._containers;
+    var containers = drop._containers;
     var parentNode = element.parentNode;
-    var i = drop.droppable._containers_length;
+    var i = drop._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) ||
+      (drop.element!=element) &&
+      ((!drop._containers) ||
         this.is_contained(element, drop)) &&
-      ((!drop.droppable.accept) ||
-        (Element.Class.has_any(element, drop.droppable.accept))) &&
-      Position.within(drop, pX, pY) );
+      ((!drop.accept) ||
+        (Element.Class.has_any(element, drop.accept))) &&
+      Position.within(drop.element, pX, pY) );
   },
   
   deactivate: function(drop) {
-    Element.Class.remove(drop, drop.droppable.hoverclass);
+    Element.Class.remove(drop.element, drop.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);
+    if(drop.hoverclass) {
+      Element.Class.add(drop.element, drop.hoverclass);
       this.last_active = drop;
     }
   },
@@ -184,10 +189,9 @@ var Droppables = {
     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) { 
+        if(drop.onHover)
+           drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
+        if(drop.greedy) { 
           this.activate(drop);
           return;
         }
@@ -200,8 +204,8 @@ var Droppables = {
     Position.prepare();
     
     if (this.is_affected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
-      if (this.last_active.droppable.onDrop) 
-        this.last_active.droppable.onDrop(element, this.last_active);
+      if (this.last_active.onDrop) 
+        this.last_active.onDrop(element, this.last_active);
     
   },
   
@@ -216,6 +220,11 @@ Draggables = {
   addObserver: function(observer) {
     this.observers.push(observer);    
   },
+  removeObserver: function(observer) {
+    for(var i = 0; i < this.observers.length; i++)
+      if(this.observers[i] = observer)
+        this.observers.splice(i,1);
+  },
   notify: function(eventName, draggable) {  // 'onStart', 'onEnd'
     for(var i = 0; i < this.observers.length; i++)
       this.observers[i][eventName](draggable);
@@ -245,9 +254,7 @@ Draggable.prototype = {
     this.element      = $(element);
     this.handle       = options.handle ? $(options.handle) : this.element;
     
-    // fix IE
-    if(!this.element.style.position)
-      this.element.style.position = 'relative';
+    Element.makePositioned(this.element); // fix IE
     
     this.offsetX      = 0;
     this.offsetY      = 0;
@@ -262,10 +269,21 @@ Draggable.prototype = {
     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));
-    Event.observe(document, "keypress", this.keyPress.bindAsEventListener(this));
+    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
+    this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
+    this.eventMouseMove = this.update.bindAsEventListener(this);
+    this.eventKeypress  = this.keyPress.bindAsEventListener(this);
+    
+    Event.observe(this.handle, "mousedown", this.eventMouseDown);
+    Event.observe(document, "mouseup", this.eventMouseUp);
+    Event.observe(document, "mousemove", this.eventMouseMove);
+    Event.observe(document, "keypress", this.eventKeypress);
+  },
+  destroy: function() {
+    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
+    Event.stopObserving(document, "mouseup", this.eventMouseUp);
+    Event.stopObserving(document, "mousemove", this.eventMouseMove);
+    Event.stopObserving(document, "keypress", this.eventKeypress);
   },
   currentLeft: function() {
     return parseInt(this.element.style.left || '0');
@@ -380,9 +398,32 @@ SortableObserver.prototype = {
 }
 
 Sortable = {
+  sortables: new Array(),
+  options: function(element){
+    var element = $(element);
+    for(var i=0;i<this.sortables.length;i++)
+      if(this.sortables[i].element == element)
+        return this.sortables[i];
+    return null;        
+  },
+  destroy: function(element){
+    var element = $(element);
+    for(var i=0;i<this.sortables.length;i++) {
+      if(this.sortables[i].element == element) {
+        var s = this.sortables[i];
+        Draggables.removeObserver(s.observer);
+        for(var j=0;j<s.droppables.length;j++)
+          Droppables.remove(s.droppables[j]);
+        for(var j=0;j<s.draggables.length;j++)
+          s.draggables[j].destroy();
+        this.sortables.splice(i,1);
+      }
+    }
+  },
   create: function(element) {
     var element = $(element);
     var options = { 
+      element:     element,
       tag:         'li',       // assumes li children, override with tag: 'tagname'
       overlap:     'vertical', // one of 'vertical', 'horizontal'
       constraint:  'vertical', // one of 'vertical', 'horizontal', false
@@ -393,7 +434,9 @@ Sortable = {
       onChange:    function() {},
       onUpdate:    function() {}
     }.extend(arguments[1] || {});
-    element.sortable = options;
+    
+    // clear any old sortable with same element
+    this.destroy(element);
     
     // build options for the draggables
     var options_for_draggable = {
@@ -443,8 +486,8 @@ Sortable = {
     // fix for gecko engine
     Element.cleanWhitespace(element); 
     
-    // for onupdate
-    Draggables.addObserver(new SortableObserver(element, options.onUpdate));
+    options.draggables = [];
+    options.droppables = [];
     
     // make it so 
     var elements = element.childNodes;
@@ -456,16 +499,27 @@ Sortable = {
         var handle = options.handle ? 
           Element.Class.childrenWith(elements[i], options.handle)[0] : elements[i];
         
-        new Draggable(elements[i], options_for_draggable.extend({ handle: handle }));
+        options.draggables.push(new Draggable(elements[i], options_for_draggable.extend({ handle: handle })));
+        
         Droppables.add(elements[i], options_for_droppable);
+        options.droppables.push(elements[i]);
+        
       }
       
+    // keep reference
+    this.sortables.push(options);
+    
+    // for onupdate
+    options.observer = new SortableObserver(element, options.onUpdate);
+    Draggables.addObserver(options.observer);
+
   },
   serialize: function(element) {
     var element = $(element);
+    var sortableOptions = this.options(element);
     var options = {
-      tag:  element.sortable.tag,
-      only: element.sortable.only,
+      tag:  sortableOptions.tag,
+      only: sortableOptions.only,
       name: element.id
     }.extend(arguments[1] || {});
     
diff --git a/actionpack/lib/action_view/helpers/javascripts/effects.js b/actionpack/lib/action_view/helpers/javascripts/effects.js
index 2b27052cda..abc706673b 100644
--- a/actionpack/lib/action_view/helpers/javascripts/effects.js
+++ b/actionpack/lib/action_view/helpers/javascripts/effects.js
@@ -127,26 +127,26 @@ Effect.Base.prototype = {
 }
 
 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);
-    }
-  });
+Effect.Parallel.prototype.extend(Effect.Base.prototype).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({
+Effect.Opacity.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element) {
     this.element = $(element);
     options = {
@@ -166,29 +166,29 @@ Effect.Opacity.prototype = (new Effect.Base()).extend({
 });
 
 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;
-     Element.makePositioned(this.element);
-     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.MoveBy.prototype.extend(Effect.Base.prototype).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;
+    Element.makePositioned(this.element);
+    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({
+Effect.Scale.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element, percent) {
     this.element = $(element)
     options = {
@@ -246,7 +246,7 @@ Effect.Scale.prototype = (new Effect.Base()).extend({
 });
 
 Effect.Highlight = Class.create();
-Effect.Highlight.prototype = (new Effect.Base()).extend({
+Effect.Highlight.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element) {
     this.element = $(element);
     
@@ -260,8 +260,9 @@ Effect.Highlight.prototype = (new Effect.Base()).extend({
       var i=0; do { endcolor += parseInt(cols[i]).toColorPart() } while (++i<3); }
       
     var options = {
-      startcolor: "#ffff99",
-      endcolor:   endcolor
+      startcolor:   "#ffff99",
+      endcolor:     endcolor,
+      restorecolor: current 
     }.extend(arguments[1] || {});
     
     // init color calculations
@@ -283,11 +284,14 @@ Effect.Highlight.prototype = (new Effect.Base()).extend({
       Math.round(this.colors_base[2]+(this.colors_delta[2]*position)) ];
     this.element.style.backgroundColor = "#" +
       colors[0].toColorPart() + colors[1].toColorPart() + colors[2].toColorPart();
+  },
+  finish: function() {
+    this.element.style.backgroundColor = this.options.restorecolor;
   }
 });
 
 Effect.ScrollTo = Class.create();
-Effect.ScrollTo.prototype = (new Effect.Base()).extend({
+Effect.ScrollTo.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element) {
     this.element = $(element);
     Position.prepare();
@@ -310,7 +314,7 @@ Effect.ScrollTo.prototype = (new Effect.Base()).extend({
 
 /* ------------- prepackaged effects ------------- */
 
-Effect.Fade =  function(element) {
+Effect.Fade = function(element) {
   options = {
   from: 1.0,
   to:   0.0,
@@ -321,7 +325,7 @@ Effect.Fade =  function(element) {
   new Effect.Opacity(element,options);
 }
 
-Effect.Appear =  function(element) {
+Effect.Appear = function(element) {
   options = {
   from: 0.0,
   to:   1.0,
diff --git a/railties/html/javascripts/dragdrop.js b/railties/html/javascripts/dragdrop.js
index eb6511095f..2bf84f1cb1 100644
--- a/railties/html/javascripts/dragdrop.js
+++ b/railties/html/javascripts/dragdrop.js
@@ -112,6 +112,12 @@ Element.Class = {
 var Droppables = {
   drops: false,
   
+  remove: function(element) {
+    for(var i = 0; i < this.drops.length; i++)
+      if(this.drops[i].element == element)
+        this.drops.splice(i,1);
+  },
+  
   add: function(element) {
     var element = $(element);
     var options = {
@@ -134,43 +140,42 @@ var Droppables = {
         options._containers.length-1;
     }
     
-    if(element.style.position=='') //fix IE
-      element.style.position = 'relative'; 
+    Element.makePositioned(element); // fix IE
     
-    // activate the droppable
-    element.droppable = options;
+    options.element = element;
     
+    // activate the droppable    
     if(!this.drops) this.drops = [];
-    this.drops.push(element);
+    this.drops.push(options);
   },
   
   is_contained: function(element, drop) {
-    var containers = drop.droppable._containers;
+    var containers = drop._containers;
     var parentNode = element.parentNode;
-    var i = drop.droppable._containers_length;
+    var i = drop._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) ||
+      (drop.element!=element) &&
+      ((!drop._containers) ||
         this.is_contained(element, drop)) &&
-      ((!drop.droppable.accept) ||
-        (Element.Class.has_any(element, drop.droppable.accept))) &&
-      Position.within(drop, pX, pY) );
+      ((!drop.accept) ||
+        (Element.Class.has_any(element, drop.accept))) &&
+      Position.within(drop.element, pX, pY) );
   },
   
   deactivate: function(drop) {
-    Element.Class.remove(drop, drop.droppable.hoverclass);
+    Element.Class.remove(drop.element, drop.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);
+    if(drop.hoverclass) {
+      Element.Class.add(drop.element, drop.hoverclass);
       this.last_active = drop;
     }
   },
@@ -184,10 +189,9 @@ var Droppables = {
     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) { 
+        if(drop.onHover)
+           drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
+        if(drop.greedy) { 
           this.activate(drop);
           return;
         }
@@ -200,8 +204,8 @@ var Droppables = {
     Position.prepare();
     
     if (this.is_affected(Event.pointerX(event), Event.pointerY(event), element, this.last_active))
-      if (this.last_active.droppable.onDrop) 
-        this.last_active.droppable.onDrop(element, this.last_active);
+      if (this.last_active.onDrop) 
+        this.last_active.onDrop(element, this.last_active);
     
   },
   
@@ -216,6 +220,11 @@ Draggables = {
   addObserver: function(observer) {
     this.observers.push(observer);    
   },
+  removeObserver: function(observer) {
+    for(var i = 0; i < this.observers.length; i++)
+      if(this.observers[i] = observer)
+        this.observers.splice(i,1);
+  },
   notify: function(eventName, draggable) {  // 'onStart', 'onEnd'
     for(var i = 0; i < this.observers.length; i++)
       this.observers[i][eventName](draggable);
@@ -245,9 +254,7 @@ Draggable.prototype = {
     this.element      = $(element);
     this.handle       = options.handle ? $(options.handle) : this.element;
     
-    // fix IE
-    if(!this.element.style.position)
-      this.element.style.position = 'relative';
+    Element.makePositioned(this.element); // fix IE
     
     this.offsetX      = 0;
     this.offsetY      = 0;
@@ -262,10 +269,21 @@ Draggable.prototype = {
     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));
-    Event.observe(document, "keypress", this.keyPress.bindAsEventListener(this));
+    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
+    this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
+    this.eventMouseMove = this.update.bindAsEventListener(this);
+    this.eventKeypress  = this.keyPress.bindAsEventListener(this);
+    
+    Event.observe(this.handle, "mousedown", this.eventMouseDown);
+    Event.observe(document, "mouseup", this.eventMouseUp);
+    Event.observe(document, "mousemove", this.eventMouseMove);
+    Event.observe(document, "keypress", this.eventKeypress);
+  },
+  destroy: function() {
+    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
+    Event.stopObserving(document, "mouseup", this.eventMouseUp);
+    Event.stopObserving(document, "mousemove", this.eventMouseMove);
+    Event.stopObserving(document, "keypress", this.eventKeypress);
   },
   currentLeft: function() {
     return parseInt(this.element.style.left || '0');
@@ -380,9 +398,32 @@ SortableObserver.prototype = {
 }
 
 Sortable = {
+  sortables: new Array(),
+  options: function(element){
+    var element = $(element);
+    for(var i=0;i<this.sortables.length;i++)
+      if(this.sortables[i].element == element)
+        return this.sortables[i];
+    return null;        
+  },
+  destroy: function(element){
+    var element = $(element);
+    for(var i=0;i<this.sortables.length;i++) {
+      if(this.sortables[i].element == element) {
+        var s = this.sortables[i];
+        Draggables.removeObserver(s.observer);
+        for(var j=0;j<s.droppables.length;j++)
+          Droppables.remove(s.droppables[j]);
+        for(var j=0;j<s.draggables.length;j++)
+          s.draggables[j].destroy();
+        this.sortables.splice(i,1);
+      }
+    }
+  },
   create: function(element) {
     var element = $(element);
     var options = { 
+      element:     element,
       tag:         'li',       // assumes li children, override with tag: 'tagname'
       overlap:     'vertical', // one of 'vertical', 'horizontal'
       constraint:  'vertical', // one of 'vertical', 'horizontal', false
@@ -393,7 +434,9 @@ Sortable = {
       onChange:    function() {},
       onUpdate:    function() {}
     }.extend(arguments[1] || {});
-    element.sortable = options;
+    
+    // clear any old sortable with same element
+    this.destroy(element);
     
     // build options for the draggables
     var options_for_draggable = {
@@ -443,8 +486,8 @@ Sortable = {
     // fix for gecko engine
     Element.cleanWhitespace(element); 
     
-    // for onupdate
-    Draggables.addObserver(new SortableObserver(element, options.onUpdate));
+    options.draggables = [];
+    options.droppables = [];
     
     // make it so 
     var elements = element.childNodes;
@@ -456,16 +499,27 @@ Sortable = {
         var handle = options.handle ? 
           Element.Class.childrenWith(elements[i], options.handle)[0] : elements[i];
         
-        new Draggable(elements[i], options_for_draggable.extend({ handle: handle }));
+        options.draggables.push(new Draggable(elements[i], options_for_draggable.extend({ handle: handle })));
+        
         Droppables.add(elements[i], options_for_droppable);
+        options.droppables.push(elements[i]);
+        
       }
       
+    // keep reference
+    this.sortables.push(options);
+    
+    // for onupdate
+    options.observer = new SortableObserver(element, options.onUpdate);
+    Draggables.addObserver(options.observer);
+
   },
   serialize: function(element) {
     var element = $(element);
+    var sortableOptions = this.options(element);
     var options = {
-      tag:  element.sortable.tag,
-      only: element.sortable.only,
+      tag:  sortableOptions.tag,
+      only: sortableOptions.only,
       name: element.id
     }.extend(arguments[1] || {});
     
diff --git a/railties/html/javascripts/effects.js b/railties/html/javascripts/effects.js
index 2b27052cda..abc706673b 100644
--- a/railties/html/javascripts/effects.js
+++ b/railties/html/javascripts/effects.js
@@ -127,26 +127,26 @@ Effect.Base.prototype = {
 }
 
 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);
-    }
-  });
+Effect.Parallel.prototype.extend(Effect.Base.prototype).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({
+Effect.Opacity.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element) {
     this.element = $(element);
     options = {
@@ -166,29 +166,29 @@ Effect.Opacity.prototype = (new Effect.Base()).extend({
 });
 
 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;
-     Element.makePositioned(this.element);
-     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.MoveBy.prototype.extend(Effect.Base.prototype).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;
+    Element.makePositioned(this.element);
+    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({
+Effect.Scale.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element, percent) {
     this.element = $(element)
     options = {
@@ -246,7 +246,7 @@ Effect.Scale.prototype = (new Effect.Base()).extend({
 });
 
 Effect.Highlight = Class.create();
-Effect.Highlight.prototype = (new Effect.Base()).extend({
+Effect.Highlight.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element) {
     this.element = $(element);
     
@@ -260,8 +260,9 @@ Effect.Highlight.prototype = (new Effect.Base()).extend({
       var i=0; do { endcolor += parseInt(cols[i]).toColorPart() } while (++i<3); }
       
     var options = {
-      startcolor: "#ffff99",
-      endcolor:   endcolor
+      startcolor:   "#ffff99",
+      endcolor:     endcolor,
+      restorecolor: current 
     }.extend(arguments[1] || {});
     
     // init color calculations
@@ -283,11 +284,14 @@ Effect.Highlight.prototype = (new Effect.Base()).extend({
       Math.round(this.colors_base[2]+(this.colors_delta[2]*position)) ];
     this.element.style.backgroundColor = "#" +
       colors[0].toColorPart() + colors[1].toColorPart() + colors[2].toColorPart();
+  },
+  finish: function() {
+    this.element.style.backgroundColor = this.options.restorecolor;
   }
 });
 
 Effect.ScrollTo = Class.create();
-Effect.ScrollTo.prototype = (new Effect.Base()).extend({
+Effect.ScrollTo.prototype.extend(Effect.Base.prototype).extend({
   initialize: function(element) {
     this.element = $(element);
     Position.prepare();
@@ -310,7 +314,7 @@ Effect.ScrollTo.prototype = (new Effect.Base()).extend({
 
 /* ------------- prepackaged effects ------------- */
 
-Effect.Fade =  function(element) {
+Effect.Fade = function(element) {
   options = {
   from: 1.0,
   to:   0.0,
@@ -321,7 +325,7 @@ Effect.Fade =  function(element) {
   new Effect.Opacity(element,options);
 }
 
-Effect.Appear =  function(element) {
+Effect.Appear = function(element) {
   options = {
   from: 0.0,
   to:   1.0,