// Some functions [getPageSize] taken from
//
//	Lightbox v2.04
//	by Lokesh Dhakar - http://www.lokeshdhakar.com
//
//	For more information, visit:
//	http://lokeshdhakar.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
function getPageSize(){	
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		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
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			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 = xScroll;		
	} else {
		pageWidth = windowWidth;
	}
	return [pageWidth,pageHeight];
}

function getWindowSize(){
	if(window.innerHeight){
		var cHeight = window.innerHeight;
	} else {
		var cHeight = document.documentElement.clientHeight;
	}
	if(window.innerWidth){
		var cWidth = window.innerWidth;
	} else {
		var cWidth = document.documentElement.clientWidth;
	}
	return [cWidth, cHeight];
}
function createBgOverlay(){
	var overlayId = "bgOverlay";
	var pageSize = getPageSize();
	var screenSize = getWindowSize();
	var tempDiv = new Element('div');
	tempDiv.innerHTML = "<div style='display:none; background-color:#000; position:absolute; left:0px; top:0px' id='"+overlayId+"'>&nbsp;</div>";
	$$('body')[0].appendChild(tempDiv);
	var processingOverlayElement = $(overlayId);
	$$('body')[0].appendChild(processingOverlayElement);
	$$('body')[0].removeChild(tempDiv);
	processingOverlayElement.setStyle({width:pageSize[0]+"px", height:pageSize[1]+"px"});
	Effect.Appear(processingOverlayElement, {duration:0.1, to:0.7});
	return processingOverlayElement;
}