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

	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({
	
	getOptions: function(){
		return {
			colour: '#000',
			opacity: 0.8,
			zIndex: 1,
			container: document.body,
			onClick: Class.empty
		};
	},
	
	initialize: function(options){
		this.setOptions(this.getOptions(), options);
		
		this.options.container = $(this.options.container);
		
		this.container = new Element('div').setProperty('id', 'OverlayContainer').setStyles({
			position: 'absolute',
			left: '0px',
			top: '0px',
			width: '100%',
			zIndex: this.options.zIndex
		}).injectInside(this.options.container);
		
		this.iframe = new Element('iframe').setProperties({
			'id': 'OverlayIframe',
			'name': 'OverlayIframe',
			'src': 'javascript:void(0);',
			'frameborder': 1,
			'scrolling': 'no'
		}).setStyles({
			'position': 'absolute',
			'top': 0,
			'left': 0,
			'filter': 'progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)',
			'opacity': 0,
			'zIndex': 1
		}).injectInside(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
		}).injectInside(this.container);
		
		this.container.addEvent('click', function(){
			this.options.onClick();
		}.bind(this));
		
		this.fade = new Fx.Style(this.container, 'opacity').set(0);
		this.position();
		
		window.addEvent('resize', this.position.bind(this));
	},
	
	getElementsByClass: function(searchClass,node,tag) {
	},
	
	getLastElementOfClass: function(searchClass) {
		var el = getElementsByClass(document,searchClass,'*');
		return el[el.length - 1];
	},
	
	position: function(){ 
		if(this.options.container == document.body){ 
			/*Additional 
			var classElements = new Array();
			var searchClass = "clearer";
			var node = document;
			var tag = '*';
			var els = node.getElementsByTagName(tag);
			var elsLen = els.length;
			var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
			for (i = 0, j = 0; i < elsLen; i++) {
				if ( pattern.test(els[i].className) ) {
					classElements[j] = els[i];
					j++;
				}
			}
			//var h = classElements[classElements.length - 1].class;
			//alert(" " + h );
			// h = '100%'; */
			// Additional End   
			//var pH = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
			//var h = pH ? pH : 0;
			//alert("Hoehe:"+h);
			
			//var h = window.outerHeight()+'px'; 
			//var h = document.body.scrollHeight || (document.height + window.getScrollHeight());
			var h = window.getScrollHeight(); 
			this.container.setStyles({top: '0px', height: h+'px'}); 
		}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(0,this.options.opacity);
	},
	
	hide: function(){
		this.fade.start(this.options.opacity,0);
	}
	
});
Overlay.implement(new Options);

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