// LOAD-ORDER: 80
/*
	"static" C_L_A_S_S
	
		or
		
	@module
	
	
		Overlay ,
		
		stripped from 
			Lightbox JS: Fullsize Image Overlays 
			by Lokesh Dhakar - http://www.huddletogether.com
		
	
*/

var Overlay = {

	OVERLAY_ID : 'overlay',
	
		
	/* @public */
	showOverlay: function(  eventListener ) {
		// set height of Overlay to take up whole page and show
		
		if ( !$(this.OVERLAY_ID) ) { this.installOverlayElement(); }	
		
		var arrayPageSize = this.getPageSize();
		
		$(this.OVERLAY_ID).style.height = (arrayPageSize[1] + 'px');
		$(this.OVERLAY_ID).show();
		
		this._eventListener = eventListener;
		
		
	},
	
	/* @public */
	hideOverlay: function( blnCallEventListener ){
		
		if ( $(this.OVERLAY_ID) )
			$(this.OVERLAY_ID).hide();
			
		if ( blnCallEventListener ){
			var obj = this._eventListener;
				
			if ( obj.onOverlayHide ){
				var func = obj.onOverlayHide.bind(obj);
				obj.onOverlayHide();
			}
		}
		
	},


	/* @private */
	installOverlayElement: function() {
		
		// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
		var objOverlay = $(document.createElement("div"));
		objOverlay.setAttribute('id', this.OVERLAY_ID );
		
		
		objOverlay.observe( 'click' , this.hideOverlay.bind(this, true) ); // this.hideOverlay.bind(this, true)/
		
		objOverlay.style.display = 'none';
		objOverlay.style.position = 'absolute';
		objOverlay.style.top = '0';
		objOverlay.style.left = '0';
		objOverlay.style.zIndex = '90';
	 	objOverlay.style.width = '100%';
	 	
	 	Element.insert( $$('body')[0], { 'bottom' : objOverlay } );		
	
	},
	
	// @private
	// getPageSize()
	// Returns array with page width, height and window width, height
	// Core code from - quirksmode.org
	// Edit for Firefox by pHaez
	//
	getPageSize: function (){
		
		var xScroll, yScroll;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = document.body.scrollWidth;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		if (self.innerHeight) {	// all except Explorer
			windowWidth = self.innerWidth;
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = windowWidth;
		} else {
			pageWidth = xScroll;
		}
	
	
		arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) ;
		return arrayPageSize;
	}
	
	
	

};