function fnShowOptions(strWindow) {
	fnShowOverlay()
	document.getElementById(strWindow).style.display = 'block';
		//document.getElementById("div2").style.display = 'block';
}

function fnHideOptions(strWindow) {
	document.getElementById(strWindow).style.display = 'none';
	document.getElementById("overlay").style.display = 'none';
}

function fnShowOverlay() {
	var dblOpacity = 0.6;
	var arrayPageSize = getPageSize();	
	var objOverlay = document.getElementById("overlay");
	objOverlay.style.backgroundColor = '#000000';
	objOverlay.style.width = arrayPageSize[0] + "px";
	objOverlay.style.height = arrayPageSize[1] + "px";
	objOverlay.style.display = "block";
	objOverlay.style.opacity = dblOpacity;
	objOverlay.style.filter = 'alpha(opacity=' + dblOpacity*100 + ')';
        objOverlay.style.position = "absolute";	
        objOverlay.style.top = "0%";
        objOverlay.style.left = "0%";
}

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.com
// Edit for Firefox by pHaez
//
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;
	}
	//alert(pageWidth);	
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}