/**************************************************************



	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(options){

		this.setOptions(this.getOptions(), options);

		

		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 h = window.getScrollHeight()+'px'; 

			this.overlay.setStyles({top: '0px', height: h}); 

		}else{ 

			var myCoords = this.options.container.getCoordinates(); 

			this.overlay.setStyles({

				top: myCoords.top+'px', 

				height: myCoords.height+'px', 

				left: myCoords.left+'px', 

				width: myCoords.width+'px'

			}); 

		} 

	},

	

	show: function(){

		this.fade.start(0,this.options.opacity);

	},

	

	hide: function(){

		this.fade.start(this.options.opacity,0);

	}

	

});

Overlay.implement(new Options);



/*************************************************************/