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Ignore traces which have not been inserted yet when calculating
[rails.git] / public / javascripts / dragdrop.js
diff --git a/public/javascripts/dragdrop.js b/public/javascripts/dragdrop.js
index a01b7be2077981531a10aad90173c0d774b7a819..07229f986f58f3b2101b7a79991d4534051e79e0 100644 (file)
--- a/public/javascripts/dragdrop.js
+++ b/public/javascripts/dragdrop.js
@@ -1,9 +1,11 @@
-// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
-//           (c) 2005 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
-// 
-// See scriptaculous.js for full license.
+// Copyright (c) 2005-2008 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
+//           (c) 2005-2008 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
+//
+// script.aculo.us is freely distributable under the terms of an MIT-style license.
+// For details, see the script.aculo.us web site: http://script.aculo.us/
 
 
-/*--------------------------------------------------------------------------*/
+if(Object.isUndefined(Effect))
+  throw("dragdrop.js requires including script.aculo.us' effects.js library");
 
 var Droppables = {
   drops: [],
 
 var Droppables = {
   drops: [],
@@ -18,20 +20,19 @@ var Droppables = {
       greedy:     true,
       hoverclass: null,
       tree:       false
       greedy:     true,
       hoverclass: null,
       tree:       false
-    }, arguments[1] || {});
+    }, arguments[1] || { });
 
     // cache containers
     if(options.containment) {
       options._containers = [];
       var containment = options.containment;
 
     // cache containers
     if(options.containment) {
       options._containers = [];
       var containment = options.containment;
-      if((typeof containment == 'object') && 
-        (containment.constructor == Array)) {
+      if(Object.isArray(containment)) {
         containment.each( function(c) { options._containers.push($(c)) });
       } else {
         options._containers.push($(containment));
       }
     }
         containment.each( function(c) { options._containers.push($(c)) });
       } else {
         options._containers.push($(containment));
       }
     }
-    
+
     if(options.accept) options.accept = [options.accept].flatten();
 
     Element.makePositioned(element); // fix IE
     if(options.accept) options.accept = [options.accept].flatten();
 
     Element.makePositioned(element); // fix IE
@@ -39,34 +40,34 @@ var Droppables = {
 
     this.drops.push(options);
   },
 
     this.drops.push(options);
   },
-  
+
   findDeepestChild: function(drops) {
     deepest = drops[0];
   findDeepestChild: function(drops) {
     deepest = drops[0];
-      
+
     for (i = 1; i < drops.length; ++i)
       if (Element.isParent(drops[i].element, deepest.element))
         deepest = drops[i];
     for (i = 1; i < drops.length; ++i)
       if (Element.isParent(drops[i].element, deepest.element))
         deepest = drops[i];
-    
+
     return deepest;
   },
 
   isContained: function(element, drop) {
     var containmentNode;
     if(drop.tree) {
     return deepest;
   },
 
   isContained: function(element, drop) {
     var containmentNode;
     if(drop.tree) {
-      containmentNode = element.treeNode; 
+      containmentNode = element.treeNode;
     } else {
       containmentNode = element.parentNode;
     }
     return drop._containers.detect(function(c) { return containmentNode == c });
   },
     } else {
       containmentNode = element.parentNode;
     }
     return drop._containers.detect(function(c) { return containmentNode == c });
   },
-  
+
   isAffected: function(point, element, drop) {
     return (
       (drop.element!=element) &&
       ((!drop._containers) ||
         this.isContained(element, drop)) &&
       ((!drop.accept) ||
   isAffected: function(point, element, drop) {
     return (
       (drop.element!=element) &&
       ((!drop._containers) ||
         this.isContained(element, drop)) &&
       ((!drop.accept) ||
-        (Element.classNames(element).detect( 
+        (Element.classNames(element).detect(
           function(v) { return drop.accept.include(v) } ) )) &&
       Position.within(drop.element, point[0], point[1]) );
   },
           function(v) { return drop.accept.include(v) } ) )) &&
       Position.within(drop.element, point[0], point[1]) );
   },
@@ -85,21 +86,23 @@ var Droppables = {
 
   show: function(point, element) {
     if(!this.drops.length) return;
 
   show: function(point, element) {
     if(!this.drops.length) return;
-    var affected = [];
-    
-    if(this.last_active) this.deactivate(this.last_active);
+    var drop, affected = [];
+
     this.drops.each( function(drop) {
       if(Droppables.isAffected(point, element, drop))
         affected.push(drop);
     });
     this.drops.each( function(drop) {
       if(Droppables.isAffected(point, element, drop))
         affected.push(drop);
     });
-        
-    if(affected.length>0) {
+
+    if(affected.length>0)
       drop = Droppables.findDeepestChild(affected);
       drop = Droppables.findDeepestChild(affected);
+
+    if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
+    if (drop) {
       Position.within(drop.element, point[0], point[1]);
       if(drop.onHover)
         drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
       Position.within(drop.element, point[0], point[1]);
       if(drop.onHover)
         drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
-      
-      Droppables.activate(drop);
+
+      if (drop != this.last_active) Droppables.activate(drop);
     }
   },
 
     }
   },
 
@@ -108,33 +111,35 @@ var Droppables = {
     Position.prepare();
 
     if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
     Position.prepare();
 
     if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
-      if (this.last_active.onDrop) 
+      if (this.last_active.onDrop) {
         this.last_active.onDrop(element, this.last_active.element, event);
         this.last_active.onDrop(element, this.last_active.element, event);
+        return true;
+      }
   },
 
   reset: function() {
     if(this.last_active)
       this.deactivate(this.last_active);
   }
   },
 
   reset: function() {
     if(this.last_active)
       this.deactivate(this.last_active);
   }
-}
+};
 
 var Draggables = {
   drags: [],
   observers: [],
 
 var Draggables = {
   drags: [],
   observers: [],
-  
+
   register: function(draggable) {
     if(this.drags.length == 0) {
       this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
       this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
       this.eventKeypress  = this.keyPress.bindAsEventListener(this);
   register: function(draggable) {
     if(this.drags.length == 0) {
       this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
       this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
       this.eventKeypress  = this.keyPress.bindAsEventListener(this);
-      
+
       Event.observe(document, "mouseup", this.eventMouseUp);
       Event.observe(document, "mousemove", this.eventMouseMove);
       Event.observe(document, "keypress", this.eventKeypress);
     }
     this.drags.push(draggable);
   },
       Event.observe(document, "mouseup", this.eventMouseUp);
       Event.observe(document, "mousemove", this.eventMouseMove);
       Event.observe(document, "keypress", this.eventKeypress);
     }
     this.drags.push(draggable);
   },
-  
+
   unregister: function(draggable) {
     this.drags = this.drags.reject(function(d) { return d==draggable });
     if(this.drags.length == 0) {
   unregister: function(draggable) {
     this.drags = this.drags.reject(function(d) { return d==draggable });
     if(this.drags.length == 0) {
@@ -143,16 +148,24 @@ var Draggables = {
       Event.stopObserving(document, "keypress", this.eventKeypress);
     }
   },
       Event.stopObserving(document, "keypress", this.eventKeypress);
     }
   },
-  
+
   activate: function(draggable) {
   activate: function(draggable) {
-    window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
-    this.activeDraggable = draggable;
+    if(draggable.options.delay) {
+      this._timeout = setTimeout(function() {
+        Draggables._timeout = null;
+        window.focus();
+        Draggables.activeDraggable = draggable;
+      }.bind(this), draggable.options.delay);
+    } else {
+      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
+      this.activeDraggable = draggable;
+    }
   },
   },
-  
+
   deactivate: function() {
     this.activeDraggable = null;
   },
   deactivate: function() {
     this.activeDraggable = null;
   },
-  
+
   updateDrag: function(event) {
     if(!this.activeDraggable) return;
     var pointer = [Event.pointerX(event), Event.pointerY(event)];
   updateDrag: function(event) {
     if(!this.activeDraggable) return;
     var pointer = [Event.pointerX(event), Event.pointerY(event)];
@@ -160,38 +173,44 @@ var Draggables = {
     // the same coordinates, prevent needless redrawing (moz bug?)
     if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
     this._lastPointer = pointer;
     // the same coordinates, prevent needless redrawing (moz bug?)
     if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
     this._lastPointer = pointer;
+
     this.activeDraggable.updateDrag(event, pointer);
   },
     this.activeDraggable.updateDrag(event, pointer);
   },
-  
+
   endDrag: function(event) {
   endDrag: function(event) {
+    if(this._timeout) {
+      clearTimeout(this._timeout);
+      this._timeout = null;
+    }
     if(!this.activeDraggable) return;
     this._lastPointer = null;
     this.activeDraggable.endDrag(event);
     this.activeDraggable = null;
   },
     if(!this.activeDraggable) return;
     this._lastPointer = null;
     this.activeDraggable.endDrag(event);
     this.activeDraggable = null;
   },
-  
+
   keyPress: function(event) {
     if(this.activeDraggable)
       this.activeDraggable.keyPress(event);
   },
   keyPress: function(event) {
     if(this.activeDraggable)
       this.activeDraggable.keyPress(event);
   },
-  
+
   addObserver: function(observer) {
     this.observers.push(observer);
     this._cacheObserverCallbacks();
   },
   addObserver: function(observer) {
     this.observers.push(observer);
     this._cacheObserverCallbacks();
   },
-  
+
   removeObserver: function(element) {  // element instead of observer fixes mem leaks
     this.observers = this.observers.reject( function(o) { return o.element==element });
     this._cacheObserverCallbacks();
   },
   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, event) {  // 'onStart', 'onEnd', 'onDrag'
     if(this[eventName+'Count'] > 0)
       this.observers.each( function(o) {
         if(o[eventName]) o[eventName](eventName, draggable, event);
       });
   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);
       });
+    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
   },
   },
-  
+
   _cacheObserverCallbacks: function() {
     ['onStart','onEnd','onDrag'].each( function(eventName) {
       Draggables[eventName+'Count'] = Draggables.observers.select(
   _cacheObserverCallbacks: function() {
     ['onStart','onEnd','onDrag'].each( function(eventName) {
       Draggables[eventName+'Count'] = Draggables.observers.select(
@@ -199,107 +218,125 @@ var Draggables = {
       ).length;
     });
   }
       ).length;
     });
   }
-}
+};
 
 /*--------------------------------------------------------------------------*/
 
 
 /*--------------------------------------------------------------------------*/
 
-var Draggable = Class.create();
-Draggable.prototype = {
+var Draggable = Class.create({
   initialize: function(element) {
   initialize: function(element) {
-    var options = Object.extend({
+    var defaults = {
       handle: false,
       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) {
         var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
       reverteffect: function(element, top_offset, left_offset) {
         var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
-        element._revert = new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur});
+        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
+          queue: {scope:'_draggable', position:'end'}
+        });
       },
       },
-      endeffect: function(element) { 
-        new Effect.Opacity(element, {duration:0.2, from:0.7, to:1.0}); 
+      endeffect: function(element) {
+        var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
+        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity,
+          queue: {scope:'_draggable', position:'end'},
+          afterFinish: function(){
+            Draggable._dragging[element] = false
+          }
+        });
       },
       zindex: 1000,
       revert: false,
       },
       zindex: 1000,
       revert: false,
+      quiet: false,
       scroll: false,
       scrollSensitivity: 20,
       scrollSpeed: 15,
       scroll: false,
       scrollSensitivity: 20,
       scrollSpeed: 15,
-      snap: false   // false, or xy or [x,y] or function(x,y){ return [x,y] }
-    }, arguments[1] || {});
+      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
+      delay: 0
+    };
+
+    if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
+      Object.extend(defaults, {
+        starteffect: function(element) {
+          element._opacity = Element.getOpacity(element);
+          Draggable._dragging[element] = true;
+          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7});
+        }
+      });
+
+    var options = Object.extend(defaults, arguments[1] || { });
 
     this.element = $(element);
 
     this.element = $(element);
-    
-    if(options.handle && (typeof options.handle == 'string')) {
-      var h = Element.childrenWithClassName(this.element, options.handle, true);
-      if(h.length>0) this.handle = h[0];
-    }
+
+    if(options.handle && Object.isString(options.handle))
+      this.handle = this.element.down('.'+options.handle, 0);
+
     if(!this.handle) this.handle = $(options.handle);
     if(!this.handle) this.handle = this.element;
     if(!this.handle) this.handle = $(options.handle);
     if(!this.handle) this.handle = this.element;
-    
-    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML)
+
+    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
       options.scroll = $(options.scroll);
       options.scroll = $(options.scroll);
+      this._isScrollChild = Element.childOf(this.element, options.scroll);
+    }
 
 
-    Element.makePositioned(this.element); // fix IE    
+    Element.makePositioned(this.element); // fix IE
 
 
-    this.delta    = this.currentDelta();
     this.options  = options;
     this.options  = options;
-    this.dragging = false;   
+    this.dragging = false;
 
     this.eventMouseDown = this.initDrag.bindAsEventListener(this);
     Event.observe(this.handle, "mousedown", this.eventMouseDown);
 
     this.eventMouseDown = this.initDrag.bindAsEventListener(this);
     Event.observe(this.handle, "mousedown", this.eventMouseDown);
-    
+
     Draggables.register(this);
   },
     Draggables.register(this);
   },
-  
+
   destroy: function() {
     Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
     Draggables.unregister(this);
   },
   destroy: function() {
     Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
     Draggables.unregister(this);
   },
-  
+
   currentDelta: function() {
     return([
       parseInt(Element.getStyle(this.element,'left') || '0'),
       parseInt(Element.getStyle(this.element,'top') || '0')]);
   },
   currentDelta: function() {
     return([
       parseInt(Element.getStyle(this.element,'left') || '0'),
       parseInt(Element.getStyle(this.element,'top') || '0')]);
   },
-  
+
   initDrag: function(event) {
   initDrag: function(event) {
-    if(Event.isLeftClick(event)) {    
+    if(!Object.isUndefined(Draggable._dragging[this.element]) &&
+      Draggable._dragging[this.element]) return;
+    if(Event.isLeftClick(event)) {
       // abort on form elements, fixes a Firefox issue
       var src = Event.element(event);
       // abort on form elements, fixes a Firefox issue
       var src = Event.element(event);
-      if(src.tagName && (
-        src.tagName=='INPUT' ||
-        src.tagName=='SELECT' ||
-        src.tagName=='OPTION' ||
-        src.tagName=='BUTTON' ||
-        src.tagName=='TEXTAREA')) return;
-        
-      if(this.element._revert) {
-        this.element._revert.cancel();
-        this.element._revert = null;
-      }
-      
+      if((tag_name = src.tagName.toUpperCase()) && (
+        tag_name=='INPUT' ||
+        tag_name=='SELECT' ||
+        tag_name=='OPTION' ||
+        tag_name=='BUTTON' ||
+        tag_name=='TEXTAREA')) return;
+
       var pointer = [Event.pointerX(event), Event.pointerY(event)];
       var pos     = Position.cumulativeOffset(this.element);
       this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
       var pointer = [Event.pointerX(event), Event.pointerY(event)];
       var pos     = Position.cumulativeOffset(this.element);
       this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
-      
+
       Draggables.activate(this);
       Event.stop(event);
     }
   },
       Draggables.activate(this);
       Event.stop(event);
     }
   },
-  
+
   startDrag: function(event) {
     this.dragging = true;
   startDrag: function(event) {
     this.dragging = true;
-    
+    if(!this.delta)
+      this.delta = this.currentDelta();
+
     if(this.options.zindex) {
       this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
       this.element.style.zIndex = this.options.zindex;
     }
     if(this.options.zindex) {
       this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
       this.element.style.zIndex = this.options.zindex;
     }
-    
+
     if(this.options.ghosting) {
       this._clone = this.element.cloneNode(true);
     if(this.options.ghosting) {
       this._clone = this.element.cloneNode(true);
-      Position.absolutize(this.element);
+      this._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
+      if (!this._originallyAbsolute)
+        Position.absolutize(this.element);
       this.element.parentNode.insertBefore(this._clone, this.element);
     }
       this.element.parentNode.insertBefore(this._clone, this.element);
     }
-    
+
     if(this.options.scroll) {
       if (this.options.scroll == window) {
         var where = this._getWindowScroll(this.options.scroll);
     if(this.options.scroll) {
       if (this.options.scroll == window) {
         var where = this._getWindowScroll(this.options.scroll);
@@ -310,29 +347,35 @@ Draggable.prototype = {
         this.originalScrollTop = this.options.scroll.scrollTop;
       }
     }
         this.originalScrollTop = this.options.scroll.scrollTop;
       }
     }
-    
+
     Draggables.notify('onStart', this, event);
     Draggables.notify('onStart', this, event);
+
     if(this.options.starteffect) this.options.starteffect(this.element);
   },
     if(this.options.starteffect) this.options.starteffect(this.element);
   },
-  
+
   updateDrag: function(event, pointer) {
     if(!this.dragging) this.startDrag(event);
   updateDrag: function(event, pointer) {
     if(!this.dragging) this.startDrag(event);
-    Position.prepare();
-    Droppables.show(pointer, this.element);
+
+    if(!this.options.quiet){
+      Position.prepare();
+      Droppables.show(pointer, this.element);
+    }
+
     Draggables.notify('onDrag', this, event);
     Draggables.notify('onDrag', this, event);
+
     this.draw(pointer);
     if(this.options.change) this.options.change(this);
     this.draw(pointer);
     if(this.options.change) this.options.change(this);
-    
+
     if(this.options.scroll) {
       this.stopScrolling();
     if(this.options.scroll) {
       this.stopScrolling();
-      
+
       var p;
       if (this.options.scroll == window) {
         with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
       } else {
         p = Position.page(this.options.scroll);
       var p;
       if (this.options.scroll == window) {
         with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
       } else {
         p = Position.page(this.options.scroll);
-        p[0] += this.options.scroll.scrollLeft;
-        p[1] += this.options.scroll.scrollTop;
+        p[0] += this.options.scroll.scrollLeft + Position.deltaX;
+        p[1] += this.options.scroll.scrollTop + Position.deltaY;
         p.push(p[0]+this.options.scroll.offsetWidth);
         p.push(p[1]+this.options.scroll.offsetHeight);
       }
         p.push(p[0]+this.options.scroll.offsetWidth);
         p.push(p[1]+this.options.scroll.offsetHeight);
       }
@@ -343,32 +386,46 @@ Draggable.prototype = {
       if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
       this.startScrolling(speed);
     }
       if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
       this.startScrolling(speed);
     }
-    
+
     // fix AppleWebKit rendering
     // fix AppleWebKit rendering
-    if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
-    
+    if(Prototype.Browser.WebKit) window.scrollBy(0,0);
+
     Event.stop(event);
   },
     Event.stop(event);
   },
-  
+
   finishDrag: function(event, success) {
     this.dragging = false;
 
   finishDrag: function(event, success) {
     this.dragging = false;
 
+    if(this.options.quiet){
+      Position.prepare();
+      var pointer = [Event.pointerX(event), Event.pointerY(event)];
+      Droppables.show(pointer, this.element);
+    }
+
     if(this.options.ghosting) {
     if(this.options.ghosting) {
-      Position.relativize(this.element);
+      if (!this._originallyAbsolute)
+        Position.relativize(this.element);
+      delete this._originallyAbsolute;
       Element.remove(this._clone);
       this._clone = null;
     }
 
       Element.remove(this._clone);
       this._clone = null;
     }
 
-    if(success) Droppables.fire(event, this.element);
+    var dropped = false;
+    if(success) {
+      dropped = Droppables.fire(event, this.element);
+      if (!dropped) dropped = false;
+    }
+    if(dropped && this.options.onDropped) this.options.onDropped(this.element);
     Draggables.notify('onEnd', this, event);
 
     var revert = this.options.revert;
     Draggables.notify('onEnd', this, event);
 
     var revert = this.options.revert;
-    if(revert && typeof revert == 'function') revert = revert(this.element);
-    
+    if(revert && Object.isFunction(revert)) revert = revert(this.element);
+
     var d = this.currentDelta();
     if(revert && this.options.reverteffect) {
     var d = this.currentDelta();
     if(revert && this.options.reverteffect) {
-      this.options.reverteffect(this.element, 
-        d[1]-this.delta[1], d[0]-this.delta[0]);
+      if (dropped == 0 || revert != 'failure')
+        this.options.reverteffect(this.element,
+          d[1]-this.delta[1], d[0]-this.delta[0]);
     } else {
       this.delta = d;
     }
     } else {
       this.delta = d;
     }
@@ -376,61 +433,67 @@ Draggable.prototype = {
     if(this.options.zindex)
       this.element.style.zIndex = this.originalZ;
 
     if(this.options.zindex)
       this.element.style.zIndex = this.originalZ;
 
-    if(this.options.endeffect) 
+    if(this.options.endeffect)
       this.options.endeffect(this.element);
 
     Draggables.deactivate(this);
     Droppables.reset();
   },
       this.options.endeffect(this.element);
 
     Draggables.deactivate(this);
     Droppables.reset();
   },
-  
+
   keyPress: function(event) {
     if(event.keyCode!=Event.KEY_ESC) return;
     this.finishDrag(event, false);
     Event.stop(event);
   },
   keyPress: function(event) {
     if(event.keyCode!=Event.KEY_ESC) return;
     this.finishDrag(event, false);
     Event.stop(event);
   },
-  
+
   endDrag: function(event) {
     if(!this.dragging) return;
     this.stopScrolling();
     this.finishDrag(event, true);
     Event.stop(event);
   },
   endDrag: function(event) {
     if(!this.dragging) return;
     this.stopScrolling();
     this.finishDrag(event, true);
     Event.stop(event);
   },
-  
+
   draw: function(point) {
     var pos = Position.cumulativeOffset(this.element);
   draw: function(point) {
     var pos = Position.cumulativeOffset(this.element);
+    if(this.options.ghosting) {
+      var r   = Position.realOffset(this.element);
+      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
+    }
+
     var d = this.currentDelta();
     pos[0] -= d[0]; pos[1] -= d[1];
     var d = this.currentDelta();
     pos[0] -= d[0]; pos[1] -= d[1];
-    
-    if(this.options.scroll && (this.options.scroll != window)) {
+
+    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
       pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
       pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
     }
       pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
       pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
     }
-    
-    var p = [0,1].map(function(i){ 
-      return (point[i]-pos[i]-this.offset[i]) 
+
+    var p = [0,1].map(function(i){
+      return (point[i]-pos[i]-this.offset[i])
     }.bind(this));
     }.bind(this));
-    
+
     if(this.options.snap) {
     if(this.options.snap) {
-      if(typeof this.options.snap == 'function') {
-        p = this.options.snap(p[0],p[1]);
+      if(Object.isFunction(this.options.snap)) {
+        p = this.options.snap(p[0],p[1],this);
       } else {
       } else {
-      if(this.options.snap instanceof Array) {
+      if(Object.isArray(this.options.snap)) {
         p = p.map( function(v, i) {
         p = p.map( function(v, i) {
-          return Math.round(v/this.options.snap[i])*this.options.snap[i] }.bind(this))
+          return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this));
       } else {
         p = p.map( function(v) {
       } else {
         p = p.map( function(v) {
-          return Math.round(v/this.options.snap)*this.options.snap }.bind(this))
+          return (v/this.options.snap).round()*this.options.snap }.bind(this));
       }
     }}
       }
     }}
-    
+
     var style = this.element.style;
     if((!this.options.constraint) || (this.options.constraint=='horizontal'))
       style.left = p[0] + "px";
     if((!this.options.constraint) || (this.options.constraint=='vertical'))
       style.top  = p[1] + "px";
     var style = this.element.style;
     if((!this.options.constraint) || (this.options.constraint=='horizontal'))
       style.left = p[0] + "px";
     if((!this.options.constraint) || (this.options.constraint=='vertical'))
       style.top  = p[1] + "px";
+
     if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
   },
     if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
   },
-  
+
   stopScrolling: function() {
     if(this.scrollInterval) {
       clearInterval(this.scrollInterval);
   stopScrolling: function() {
     if(this.scrollInterval) {
       clearInterval(this.scrollInterval);
@@ -438,13 +501,14 @@ Draggable.prototype = {
       Draggables._lastScrollPointer = null;
     }
   },
       Draggables._lastScrollPointer = null;
     }
   },
-  
+
   startScrolling: function(speed) {
   startScrolling: function(speed) {
+    if(!(speed[0] || speed[1])) return;
     this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
     this.lastScrolled = new Date();
     this.scrollInterval = setInterval(this.scroll.bind(this), 10);
   },
     this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
     this.lastScrolled = new Date();
     this.scrollInterval = setInterval(this.scroll.bind(this), 10);
   },
-  
+
   scroll: function() {
     var current = new Date();
     var delta = current - this.lastScrolled;
   scroll: function() {
     var current = new Date();
     var delta = current - this.lastScrolled;
@@ -460,22 +524,24 @@ Draggable.prototype = {
       this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
       this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
     }
       this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
       this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
     }
-    
+
     Position.prepare();
     Droppables.show(Draggables._lastPointer, this.element);
     Draggables.notify('onDrag', this);
     Position.prepare();
     Droppables.show(Draggables._lastPointer, this.element);
     Draggables.notify('onDrag', this);
-    Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
-    Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
-    Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
-    if (Draggables._lastScrollPointer[0] < 0)
-      Draggables._lastScrollPointer[0] = 0;
-    if (Draggables._lastScrollPointer[1] < 0)
-      Draggables._lastScrollPointer[1] = 0;
-    this.draw(Draggables._lastScrollPointer);
-    
+    if (this._isScrollChild) {
+      Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
+      Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
+      Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
+      if (Draggables._lastScrollPointer[0] < 0)
+        Draggables._lastScrollPointer[0] = 0;
+      if (Draggables._lastScrollPointer[1] < 0)
+        Draggables._lastScrollPointer[1] = 0;
+      this.draw(Draggables._lastScrollPointer);
+    }
+
     if(this.options.change) this.options.change(this);
   },
     if(this.options.change) this.options.change(this);
   },
-  
+
   _getWindowScroll: function(w) {
     var T, L, W, H;
     with (w.document) {
   _getWindowScroll: function(w) {
     var T, L, W, H;
     with (w.document) {
@@ -494,39 +560,42 @@ Draggable.prototype = {
         H = documentElement.clientHeight;
       } else {
         W = body.offsetWidth;
         H = documentElement.clientHeight;
       } else {
         W = body.offsetWidth;
-        H = body.offsetHeight
+        H = body.offsetHeight;
       }
     }
     return { top: T, left: L, width: W, height: H };
   }
       }
     }
     return { top: T, left: L, width: W, height: H };
   }
-}
+});
+
+Draggable._dragging = { };
 
 /*--------------------------------------------------------------------------*/
 
 
 /*--------------------------------------------------------------------------*/
 
-var SortableObserver = Class.create();
-SortableObserver.prototype = {
+var SortableObserver = Class.create({
   initialize: function(element, observer) {
     this.element   = $(element);
     this.observer  = observer;
     this.lastValue = Sortable.serialize(this.element);
   },
   initialize: function(element, observer) {
     this.element   = $(element);
     this.observer  = observer;
     this.lastValue = Sortable.serialize(this.element);
   },
-  
+
   onStart: function() {
     this.lastValue = Sortable.serialize(this.element);
   },
   onStart: function() {
     this.lastValue = Sortable.serialize(this.element);
   },
-  
+
   onEnd: function() {
     Sortable.unmark();
     if(this.lastValue != Sortable.serialize(this.element))
       this.observer(this.element)
   }
   onEnd: function() {
     Sortable.unmark();
     if(this.lastValue != Sortable.serialize(this.element))
       this.observer(this.element)
   }
-}
+});
 
 var Sortable = {
 
 var Sortable = {
-  sortables: {},
-  
+  SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
+
+  sortables: { },
+
   _findRootElement: function(element) {
   _findRootElement: function(element) {
-    while (element.tagName != "BODY") {  
+    while (element.tagName.toUpperCase() != "BODY") {
       if(element.id && Sortable.sortables[element.id]) return element;
       element = element.parentNode;
     }
       if(element.id && Sortable.sortables[element.id]) return element;
       element = element.parentNode;
     }
@@ -537,22 +606,23 @@ var Sortable = {
     if(!element) return;
     return Sortable.sortables[element.id];
   },
     if(!element) return;
     return Sortable.sortables[element.id];
   },
-  
+
   destroy: function(element){
   destroy: function(element){
-    var s = Sortable.options(element);
-    
+    element = $(element);
+    var s = Sortable.sortables[element.id];
+
     if(s) {
       Draggables.removeObserver(s.element);
       s.droppables.each(function(d){ Droppables.remove(d) });
       s.draggables.invoke('destroy');
     if(s) {
       Draggables.removeObserver(s.element);
       s.droppables.each(function(d){ Droppables.remove(d) });
       s.draggables.invoke('destroy');
-      
+
       delete Sortable.sortables[s.element.id];
     }
   },
 
   create: function(element) {
     element = $(element);
       delete Sortable.sortables[s.element.id];
     }
   },
 
   create: function(element) {
     element = $(element);
-    var options = Object.extend({ 
+    var options = Object.extend({
       element:     element,
       tag:         'li',       // assumes li children, override with tag: 'tagname'
       dropOnEmpty: false,
       element:     element,
       tag:         'li',       // assumes li children, override with tag: 'tagname'
       dropOnEmpty: false,
@@ -563,15 +633,23 @@ var Sortable = {
       containment: element,    // also takes array of elements (or id's); or false
       handle:      false,      // or a CSS class
       only:        false,
       containment: element,    // also takes array of elements (or id's); or false
       handle:      false,      // or a CSS class
       only:        false,
+      delay:       0,
       hoverclass:  null,
       ghosting:    false,
       hoverclass:  null,
       ghosting:    false,
+      quiet:       false,
       scroll:      false,
       scrollSensitivity: 20,
       scrollSpeed: 15,
       scroll:      false,
       scrollSensitivity: 20,
       scrollSpeed: 15,
-      format:      /^[^_]*_(.*)$/,
+      format:      this.SERIALIZE_RULE,
+
+      // these take arrays of elements or ids and can be
+      // used for better initialization performance
+      elements:    false,
+      handles:     false,
+
       onChange:    Prototype.emptyFunction,
       onUpdate:    Prototype.emptyFunction
       onChange:    Prototype.emptyFunction,
       onUpdate:    Prototype.emptyFunction
-    }, arguments[1] || {});
+    }, arguments[1] || { });
 
     // clear any old sortable with same element
     this.destroy(element);
 
     // clear any old sortable with same element
     this.destroy(element);
@@ -579,9 +657,11 @@ var Sortable = {
     // build options for the draggables
     var options_for_draggable = {
       revert:      true,
     // build options for the draggables
     var options_for_draggable = {
       revert:      true,
+      quiet:       options.quiet,
       scroll:      options.scroll,
       scrollSpeed: options.scrollSpeed,
       scrollSensitivity: options.scrollSensitivity,
       scroll:      options.scroll,
       scrollSpeed: options.scrollSpeed,
       scrollSensitivity: options.scrollSensitivity,
+      delay:       options.delay,
       ghosting:    options.ghosting,
       constraint:  options.constraint,
       handle:      options.handle };
       ghosting:    options.ghosting,
       constraint:  options.constraint,
       handle:      options.handle };
@@ -603,25 +683,24 @@ var Sortable = {
     if(options.zindex)
       options_for_draggable.zindex = options.zindex;
 
     if(options.zindex)
       options_for_draggable.zindex = options.zindex;
 
-    // build options for the droppables  
+    // build options for the droppables
     var options_for_droppable = {
       overlap:     options.overlap,
       containment: options.containment,
       tree:        options.tree,
       hoverclass:  options.hoverclass,
       onHover:     Sortable.onHover
     var options_for_droppable = {
       overlap:     options.overlap,
       containment: options.containment,
       tree:        options.tree,
       hoverclass:  options.hoverclass,
       onHover:     Sortable.onHover
-      //greedy:      !options.dropOnEmpty
-    }
-    
+    };
+
     var options_for_tree = {
       onHover:      Sortable.onEmptyHover,
       overlap:      options.overlap,
       containment:  options.containment,
       hoverclass:   options.hoverclass
     var options_for_tree = {
       onHover:      Sortable.onEmptyHover,
       overlap:      options.overlap,
       containment:  options.containment,
       hoverclass:   options.hoverclass
-    }
+    };
 
     // fix for gecko engine
 
     // fix for gecko engine
-    Element.cleanWhitespace(element); 
+    Element.cleanWhitespace(element);
 
     options.draggables = [];
     options.droppables = [];
 
     options.draggables = [];
     options.droppables = [];
@@ -632,17 +711,16 @@ var Sortable = {
       options.droppables.push(element);
     }
 
       options.droppables.push(element);
     }
 
-    (this.findElements(element, options) || []).each( function(e) {
-      // handles are per-draggable
-      var handle = options.handle ? 
-        Element.childrenWithClassName(e, options.handle)[0] : e;    
+    (options.elements || this.findElements(element, options) || []).each( function(e,i) {
+      var handle = options.handles ? $(options.handles[i]) :
+        (options.handle ? $(e).select('.' + options.handle)[0] : e);
       options.draggables.push(
         new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
       Droppables.add(e, options_for_droppable);
       if(options.tree) e.treeNode = element;
       options.draggables.push(
         new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
       Droppables.add(e, options_for_droppable);
       if(options.tree) e.treeNode = element;
-      options.droppables.push(e);      
+      options.droppables.push(e);
     });
     });
-    
+
     if(options.tree) {
       (Sortable.findTreeElements(element, options) || []).each( function(e) {
         Droppables.add(e, options_for_tree);
     if(options.tree) {
       (Sortable.findTreeElements(element, options) || []).each( function(e) {
         Droppables.add(e, options_for_tree);
@@ -664,7 +742,7 @@ var Sortable = {
     return Element.findChildren(
       element, options.only, options.tree ? true : false, options.tag);
   },
     return Element.findChildren(
       element, options.only, options.tree ? true : false, options.tag);
   },
-  
+
   findTreeElements: function(element, options) {
     return Element.findChildren(
       element, options.only, options.tree ? true : false, options.treeTag);
   findTreeElements: function(element, options) {
     return Element.findChildren(
       element, options.only, options.tree ? true : false, options.treeTag);
@@ -681,7 +759,7 @@ var Sortable = {
         var oldParentNode = element.parentNode;
         element.style.visibility = "hidden"; // fix gecko rendering
         dropon.parentNode.insertBefore(element, dropon);
         var oldParentNode = element.parentNode;
         element.style.visibility = "hidden"; // fix gecko rendering
         dropon.parentNode.insertBefore(element, dropon);
-        if(dropon.parentNode!=oldParentNode) 
+        if(dropon.parentNode!=oldParentNode)
           Sortable.options(oldParentNode).onChange(element);
         Sortable.options(dropon.parentNode).onChange(element);
       }
           Sortable.options(oldParentNode).onChange(element);
         Sortable.options(dropon.parentNode).onChange(element);
       }
@@ -692,26 +770,26 @@ var Sortable = {
         var oldParentNode = element.parentNode;
         element.style.visibility = "hidden"; // fix gecko rendering
         dropon.parentNode.insertBefore(element, nextElement);
         var oldParentNode = element.parentNode;
         element.style.visibility = "hidden"; // fix gecko rendering
         dropon.parentNode.insertBefore(element, nextElement);
-        if(dropon.parentNode!=oldParentNode) 
+        if(dropon.parentNode!=oldParentNode)
           Sortable.options(oldParentNode).onChange(element);
         Sortable.options(dropon.parentNode).onChange(element);
       }
     }
   },
           Sortable.options(oldParentNode).onChange(element);
         Sortable.options(dropon.parentNode).onChange(element);
       }
     }
   },
-  
+
   onEmptyHover: function(element, dropon, overlap) {
     var oldParentNode = element.parentNode;
     var droponOptions = Sortable.options(dropon);
   onEmptyHover: function(element, dropon, overlap) {
     var oldParentNode = element.parentNode;
     var droponOptions = Sortable.options(dropon);
-        
+
     if(!Element.isParent(dropon, element)) {
       var index;
     if(!Element.isParent(dropon, element)) {
       var index;
-      
-      var children = Sortable.findElements(dropon, {tag: droponOptions.tag});
+
+      var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
       var child = null;
       var child = null;
-            
+
       if(children) {
         var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
       if(children) {
         var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
-        
+
         for (index = 0; index < children.length; index += 1) {
           if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
             offset -= Element.offsetSize (children[index], droponOptions.overlap);
         for (index = 0; index < children.length; index += 1) {
           if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
             offset -= Element.offsetSize (children[index], droponOptions.overlap);
@@ -724,79 +802,66 @@ var Sortable = {
           }
         }
       }
           }
         }
       }
-      
+
       dropon.insertBefore(element, child);
       dropon.insertBefore(element, child);
-      
+
       Sortable.options(oldParentNode).onChange(element);
       droponOptions.onChange(element);
     }
   },
 
   unmark: function() {
       Sortable.options(oldParentNode).onChange(element);
       droponOptions.onChange(element);
     }
   },
 
   unmark: function() {
-    if(Sortable._marker) Element.hide(Sortable._marker);
+    if(Sortable._marker) Sortable._marker.hide();
   },
 
   mark: function(dropon, position) {
     // mark on ghosting only
     var sortable = Sortable.options(dropon.parentNode);
   },
 
   mark: function(dropon, position) {
     // mark on ghosting only
     var sortable = Sortable.options(dropon.parentNode);
-    if(sortable && !sortable.ghosting) return; 
+    if(sortable && !sortable.ghosting) return;
 
     if(!Sortable._marker) {
 
     if(!Sortable._marker) {
-      Sortable._marker = $('dropmarker') || document.createElement('DIV');
-      Element.hide(Sortable._marker);
-      Element.addClassName(Sortable._marker, 'dropmarker');
-      Sortable._marker.style.position = 'absolute';
+      Sortable._marker =
+        ($('dropmarker') || Element.extend(document.createElement('DIV'))).
+          hide().addClassName('dropmarker').setStyle({position:'absolute'});
       document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
       document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
-    }    
+    }
     var offsets = Position.cumulativeOffset(dropon);
     var offsets = Position.cumulativeOffset(dropon);
-    Sortable._marker.style.left = offsets[0] + 'px';
-    Sortable._marker.style.top = offsets[1] + 'px';
-    
+    Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
+
     if(position=='after')
     if(position=='after')
-      if(sortable.overlap == 'horizontal') 
-        Sortable._marker.style.left = (offsets[0]+dropon.clientWidth) + 'px';
+      if(sortable.overlap == 'horizontal')
+        Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
       else
       else
-        Sortable._marker.style.top = (offsets[1]+dropon.clientHeight) + 'px';
-    
-    Element.show(Sortable._marker);
+        Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
+
+    Sortable._marker.show();
   },
   },
-  
+
   _tree: function(element, options, parent) {
     var children = Sortable.findElements(element, options) || [];
   _tree: function(element, options, parent) {
     var children = Sortable.findElements(element, options) || [];
-  
+
     for (var i = 0; i < children.length; ++i) {
       var match = children[i].id.match(options.format);
 
       if (!match) continue;
     for (var i = 0; i < children.length; ++i) {
       var match = children[i].id.match(options.format);
 
       if (!match) continue;
-      
+
       var child = {
         id: encodeURIComponent(match ? match[1] : null),
         element: element,
         parent: parent,
       var child = {
         id: encodeURIComponent(match ? match[1] : null),
         element: element,
         parent: parent,
-        children: new Array,
+        children: [],
         position: parent.children.length,
         position: parent.children.length,
-        container: Sortable._findChildrenElement(children[i], options.treeTag.toUpperCase())
-      }
-      
+        container: $(children[i]).down(options.treeTag)
+      };
+
       /* Get the element containing the children and recurse over it */
       if (child.container)
       /* Get the element containing the children and recurse over it */
       if (child.container)
-        this._tree(child.container, options, child)
-      
+        this._tree(child.container, options, child);
+
       parent.children.push (child);
     }
 
       parent.children.push (child);
     }
 
-    return parent; 
-  },
-
-  /* Finds the first element of the given tag type within a parent element.
-    Used for finding the first LI[ST] within a L[IST]I[TEM].*/
-  _findChildrenElement: function (element, containerTag) {
-    if (element && element.hasChildNodes)
-      for (var i = 0; i < element.childNodes.length; ++i)
-        if (element.childNodes[i].tagName == containerTag)
-          return element.childNodes[i];
-  
-    return null;
+    return parent;
   },
 
   tree: function(element) {
   },
 
   tree: function(element) {
@@ -808,17 +873,17 @@ var Sortable = {
       only: sortableOptions.only,
       name: element.id,
       format: sortableOptions.format
       only: sortableOptions.only,
       name: element.id,
       format: sortableOptions.format
-    }, arguments[1] || {});
-    
+    }, arguments[1] || { });
+
     var root = {
       id: null,
       parent: null,
     var root = {
       id: null,
       parent: null,
-      children: new Array,
+      children: [],
       container: element,
       position: 0
       container: element,
       position: 0
-    }
-    
-    return Sortable._tree (element, options, root);
+    };
+
+    return Sortable._tree(element, options, root);
   },
 
   /* Construct a [i] index for a particular node */
   },
 
   /* Construct a [i] index for a particular node */
@@ -832,8 +897,8 @@ var Sortable = {
 
   sequence: function(element) {
     element = $(element);
 
   sequence: function(element) {
     element = $(element);
-    var options = Object.extend(this.options(element), arguments[1] || {});
-    
+    var options = Object.extend(this.options(element), arguments[1] || { });
+
     return $(this.findElements(element, options) || []).map( function(item) {
       return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
     });
     return $(this.findElements(element, options) || []).map( function(item) {
       return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
     });
@@ -841,15 +906,15 @@ var Sortable = {
 
   setSequence: function(element, new_sequence) {
     element = $(element);
 
   setSequence: function(element, new_sequence) {
     element = $(element);
-    var options = Object.extend(this.options(element), arguments[2] || {});
-    
-    var nodeMap = {};
+    var options = Object.extend(this.options(element), arguments[2] || { });
+
+    var nodeMap = { };
     this.findElements(element, options).each( function(n) {
         if (n.id.match(options.format))
             nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
         n.parentNode.removeChild(n);
     });
     this.findElements(element, options).each( function(n) {
         if (n.id.match(options.format))
             nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
         n.parentNode.removeChild(n);
     });
-   
+
     new_sequence.each(function(ident) {
       var n = nodeMap[ident];
       if (n) {
     new_sequence.each(function(ident) {
       var n = nodeMap[ident];
       if (n) {
@@ -858,16 +923,16 @@ var Sortable = {
       }
     });
   },
       }
     });
   },
-  
+
   serialize: function(element) {
     element = $(element);
   serialize: function(element) {
     element = $(element);
-    var options = Object.extend(Sortable.options(element), arguments[1] || {});
+    var options = Object.extend(Sortable.options(element), arguments[1] || { });
     var name = encodeURIComponent(
       (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
     var name = encodeURIComponent(
       (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
-    
+
     if (options.tree) {
       return Sortable.tree(element, arguments[1]).children.map( function (item) {
     if (options.tree) {
       return Sortable.tree(element, arguments[1]).children.map( function (item) {
-        return [name + Sortable._constructIndex(item) + "=" + 
+        return [name + Sortable._constructIndex(item) + "[id]=" +
                 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
       }).flatten().join('&');
     } else {
                 encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
       }).flatten().join('&');
     } else {
@@ -876,18 +941,16 @@ var Sortable = {
       }).join('&');
     }
   }
       }).join('&');
     }
   }
-}
+};
 
 
-/* Returns true if child is contained within element */
+// Returns true if child is contained within element
 Element.isParent = function(child, element) {
   if (!child.parentNode || child == element) return false;
 Element.isParent = function(child, element) {
   if (!child.parentNode || child == element) return false;
-
   if (child.parentNode == element) return true;
   if (child.parentNode == element) return true;
-
   return Element.isParent(child.parentNode, element);
   return Element.isParent(child.parentNode, element);
-}
+};
 
 
-Element.findChildren = function(element, only, recursive, tagName) {    
+Element.findChildren = function(element, only, recursive, tagName) {
   if(!element.hasChildNodes()) return null;
   tagName = tagName.toUpperCase();
   if(only) only = [only].flatten();
   if(!element.hasChildNodes()) return null;
   tagName = tagName.toUpperCase();
   if(only) only = [only].flatten();
@@ -903,11 +966,8 @@ Element.findChildren = function(element, only, recursive, tagName) {
   });
 
   return (elements.length>0 ? elements.flatten() : []);
   });
 
   return (elements.length>0 ? elements.flatten() : []);
-}
+};
 
 Element.offsetSize = function (element, type) {
 
 Element.offsetSize = function (element, type) {
-  if (type == 'vertical' || type == 'height')
-    return element.offsetHeight;
-  else
-    return element.offsetWidth;
-}
\ No newline at end of file
+  return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
+};
\ No newline at end of file
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