var Mask=new Class({Implements:[Options,Events],Binds:["position"],options:{style:{},"class":"mask",maskMargins:false,useIframeShim:true,iframeShimOptions:{}},initialize:function(target,options){this.target=document.id(target)||document.id(document.body);this.target.store("mask",this);this.setOptions(options);this.render();this.inject()},render:function(){this.element=new Element("div",{"class":this.options["class"],id:this.options.id||"mask-"+String.uniqueID(),styles:Object.merge({},this.options.style,{display:"none"}),events:{click:function(event){this.fireEvent("click",event);if(this.options.hideOnClick){this.hide()}}.bind(this)}});this.hidden=true},toElement:function(){return this.element},inject:function(target,where){where=where||(this.options.inject?this.options.inject.where:"")||this.target==document.body?"inside":"after";target=target||(this.options.inject&&this.options.inject.target)||this.target;this.element.inject(target,where);if(this.options.useIframeShim){this.shim=new IframeShim(this.element,this.options.iframeShimOptions);this.addEvents({show:this.shim.show.bind(this.shim),hide:this.shim.hide.bind(this.shim),destroy:this.shim.destroy.bind(this.shim)})}},position:function(){this.resize(this.options.width,this.options.height);this.element.position({relativeTo:this.target,position:"topLeft",ignoreMargins:!this.options.maskMargins,ignoreScroll:this.target==document.body});return this},resize:function(x,y){var opt={styles:["padding","border"]};if(this.options.maskMargins){opt.styles.push("margin")}var dim=this.target.getComputedSize(opt);if(this.target==document.body){this.element.setStyles({width:0,height:0});var win=window.getScrollSize();if(dim.totalHeight<win.y){dim.totalHeight=win.y}if(dim.totalWidth<win.x){dim.totalWidth=win.x}}this.element.setStyles({width:Array.pick([x,dim.totalWidth,dim.x]),height:Array.pick([y,dim.totalHeight,dim.y])});return this},show:function(){if(!this.hidden){return this}window.addEvent("resize",this.position);this.position();this.showMask.apply(this,arguments);return this},showMask:function(){this.element.setStyle("display","block");this.hidden=false;this.fireEvent("show")},hide:function(){if(this.hidden){return this}window.removeEvent("resize",this.position);this.hideMask.apply(this,arguments);if(this.options.destroyOnHide){return this.destroy()}return this},hideMask:function(){this.element.setStyle("display","none");this.hidden=true;this.fireEvent("hide")},toggle:function(){this[this.hidden?"show":"hide"]()},destroy:function(){this.hide();this.element.destroy();this.fireEvent("destroy");this.target.eliminate("mask")}});Element.Properties.mask={set:function(options){var mask=this.retrieve("mask");if(mask){mask.destroy()}return this.eliminate("mask").store("mask:options",options)},get:function(){var mask=this.retrieve("mask");if(!mask){mask=new Mask(this,this.retrieve("mask:options"));this.store("mask",mask)}return mask}};Element.implement({mask:function(options){if(options){this.set("mask",options)}this.get("mask").show();return this},unmask:function(){this.get("mask").hide();return this}});