Returning this from methods

Source/Overlay-yui-compressed.js

@@ -15,4 +15,4 @@ provides:
   - Overlay
 ...
 */
-var Overlay=new Class({Implements:[Options,Events],options:{id:"overlay",color:"#000",duration:500,opacity:0.5,zIndex:5000},initialize:function(a,b){this.setOptions(b);this.container=document.id(a);this.overlay=new Element("div",{id:this.options.id,opacity:0,styles:{position:"absolute",background:this.options.color,left:0,top:0,"z-index":this.options.zIndex},events:{click:function(){this.fireEvent("click");}.bind(this)}}).inject(this.container);this.tween=new Fx.Tween(this.overlay,{duration:this.options.duration,link:"cancel",property:"opacity",onStart:function(){this.overlay.setStyles({width:"100%",height:this.container.getScrollSize().y});}.bind(this),onComplete:function(){this.fireEvent(this.overlay.get("opacity")==this.options.opacity?"show":"hide");}.bind(this)});},open:function(){this.fireEvent("open");this.tween.start(this.options.opacity);},close:function(){this.fireEvent("close");this.tween.start(0);}});
+var Overlay=new Class({Implements:[Options,Events],options:{id:"overlay",color:"#000",duration:500,opacity:0.5,zIndex:5000},initialize:function(a,b){this.setOptions(b);this.container=document.id(a);this.overlay=new Element("div",{id:this.options.id,opacity:0,styles:{position:"absolute",background:this.options.color,left:0,top:0,"z-index":this.options.zIndex},events:{click:function(){this.fireEvent("click");}.bind(this)}}).inject(this.container);this.tween=new Fx.Tween(this.overlay,{duration:this.options.duration,link:"cancel",property:"opacity",onStart:function(){this.overlay.setStyles({width:"100%",height:this.container.getScrollSize().y});}.bind(this),onComplete:function(){this.fireEvent(this.overlay.get("opacity")==this.options.opacity?"show":"hide");}.bind(this)});},open:function(){this.fireEvent("open");this.tween.start(this.options.opacity);return this;},close:function(){this.fireEvent("close");this.tween.start(0);return this;}});

Source/Overlay.js

@@ -70,9 +70,11 @@ var Overlay = new Class({
 	open: function() {
 		this.fireEvent('open');
 		this.tween.start(this.options.opacity);
+		return this;
 	},
 	close: function() {
 		this.fireEvent('close');
 		this.tween.start(0);
+		return this;
 	}
 });