/*Script: Overlay Version: 1.1 Authors : Samuel birch Desc: Covers the window with a semi-transparent layer. Licence: Open Source MIT Licence*/
var Overlay=new Class({getOptions:function(){return{colour:"#000",opacity:0.7,zIndex:1,container:document.body,onClick:Class.empty}},initialize:function(A){this.setOptions(this.getOptions(),A);this.options.container=$(this.options.container);this.overlay=new Element("div").setProperty("id","Overlay").setStyles({position:"absolute",left:"0px",top:"0px",width:"100%",zIndex:this.options.zIndex,backgroundColor:this.options.colour}).injectInside(this.options.container);this.overlay.addEvent("click",function(){this.options.onClick()}.bind(this));this.fade=new Fx.Style(this.overlay,"opacity").set(0);this.position();window.addEvent("resize",this.position.bind(this))},position:function(){if(this.options.container==document.body){var A=window.getScrollHeight()+"px";this.overlay.setStyles({top:"0px",height:A})}else{var B=this.options.container.getCoordinates();this.overlay.setStyles({top:B.top+"px",height:B.height+"px",left:B.left+"px",width:B.width+"px"})}},show:function(){this.fade.start(0,this.options.opacity)},hide:function(){this.fade.start(this.options.opacity,0)}});Overlay.implement(new Options);