Drag.Move=new Class({Extends:Drag,options:{droppables:[],container:false},initialize:function(element,options){this.parent(element,options);this.droppables=$$(this.options.droppables);this.container=$(this.options.container);if(this.container&&$type(this.container)!='element')this.container=$(this.container.getDocument().body);element=this.element;var current=element.getStyle('position');var position=(current!='static')?current:'absolute';if(element.getStyle('left')=='auto'||element.getStyle('top')=='auto')element.position(element.getPosition(element.offsetParent));element.setStyle('position',position);this.addEvent('start',function(){this.checkDroppables();},true);},start:function(event){if(this.container){var el=this.element,cont=this.container,ccoo=cont.getCoordinates(el.offsetParent),cps={},ems={};['top','right','bottom','left'].each(function(pad){cps[pad]=cont.getStyle('padding-'+pad).toInt();ems[pad]=el.getStyle('margin-'+pad).toInt();},this);var width=el.offsetWidth+ems.left+ems.right,height=el.offsetHeight+ems.top+ems.bottom;var x=[ccoo.left+cps.left,ccoo.right-cps.right-width];var y=[ccoo.top+cps.top,ccoo.bottom-cps.bottom-height];this.options.limit={x:x,y:y};}
this.parent(event);},checkAgainst:function(el){el=el.getCoordinates();var now=this.mouse.now;return(now.x>el.left&&now.x<el.right&&now.y<el.bottom&&now.y>el.top);},checkDroppables:function(){var overed=this.droppables.filter(this.checkAgainst,this).getLast();if(this.overed!=overed){if(this.overed)this.fireEvent('leave',[this.element,this.overed]);if(overed){this.overed=overed;this.fireEvent('enter',[this.element,overed]);}else{this.overed=null;}}},drag:function(event){this.parent(event);if(this.droppables.length)this.checkDroppables();},stop:function(event){this.checkDroppables();this.fireEvent('drop',[this.element,this.overed]);this.overed=null;return this.parent(event);}});Element.implement({makeDraggable:function(options){return new Drag.Move(this,options);}});