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



	Script		: Overlay

	Version		: 1.2

	Authors		: Samuel birch

	Desc		: Covers the window with a semi-transparent layer.

	Licence		: Open Source MIT Licence



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



var Overlay = new Class({

	Implements: Options,

	options: {

		colour: '#000',

		opacity: 0.7,

		zIndex: 1,

		container: document.body,

		onClick: $empty

	},



	initialize: function(options){

		this.setOptions(options);

		

		this.options.container = $(this.options.container) || document.body;

		

		this.container = new Element('div').setProperty('id', 'OverlayContainer').setStyles({

			position: 'absolute',

			left: '0px',

			top: '0px',

			width: '100%',

			height: '100%',

			zIndex: this.options.zIndex

		}).inject(this.options.container);

		

		this.iframe = new Element('iframe').setProperties({

			'id': 'OverlayIframe',

			'name': 'OverlayIframe',

			'src': 'javascript:void(0);',

			'frameborder': 0,

			'scrolling': 'no'

		}).setStyles({

			'position': 'absolute',

			'top': 0,

			'left': 0,

			'width': '100%',

			'height': '100%',

			'filter': 'progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)',

			'opacity': 0,

			'zIndex': 1

		}).inject(this.container);

		

		this.overlay = new Element('div').setProperty('id', 'Overlay').setStyles({

			position: 'absolute',

			left: '0px',

			top: '0px',

			width: '100%',

			height: '100%',

			zIndex: 2,

			backgroundColor: this.options.colour

		}).inject(this.container);

		

		this.container.addEvent('click', function(){

			this.options.onClick();

		}.bind(this));

		

		this.fade = new Fx.Tween(this.container).set('opacity', 0);

		this.position();

		

		window.addEvent('resize', this.position.bind(this));

	},

	

	position: function(){ 

		if(this.options.container == document.body){ 

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

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

		}else{ 

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

			this.container.setStyles({

				top: myCoords.top+'px', 

				height: myCoords.height+'px', 

				left: myCoords.left+'px', 

				width: myCoords.width+'px'

			}); 

		} 

	},

	

	show: function(){

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

	},

	

	hide: function(){

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

	}

	

});



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