function rolloverImage(imageName, imageSrc)
	{
		document[imageName].src = imageSrc;
	}
	
	
	function toggle(div_id) {
		var el = document.getElementById(div_id);
		if ( el.style.display == 'none' ) {	el.style.display = 'block';}
		else {el.style.display = 'none';}
	}
	
	
	function blanket_size(popUpDivVar) {
		if (typeof window.innerWidth != 'undefined') {
			viewportheight = window.innerHeight;
		} else {
			viewportheight = document.documentElement.clientHeight;
		}
		if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
			blanket_height = viewportheight;
		} else {
			if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
				blanket_height = document.body.parentNode.clientHeight;
			} else {
				blanket_height = document.body.parentNode.scrollHeight;
			}
		}
		var blanket = document.getElementById('blanket');
		blanket.style.height = blanket_height + 'px';
		var popUpDiv = document.getElementById(popUpDivVar);
		popUpDiv_height=blanket_height/2-150;//150 is half popup's height
		popUpDiv.style.top = popUpDiv_height + 'px';
	}
	
	function window_pos(popUpDivVar) {
		if (typeof window.innerWidth != 'undefined') {
			viewportwidth = window.innerHeight;
		} else {
			viewportwidth = document.documentElement.clientHeight;
		}
		if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
			window_width = viewportwidth;
		} else {
			if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
				window_width = document.body.parentNode.clientWidth;
			} else {
				window_width = document.body.parentNode.scrollWidth;
			}
		}
		var popUpDiv = document.getElementById(popUpDivVar);
		window_width = window_width/2-150;//150 is half popup's width
		popUpDiv.style.left = window_width - 100 + 'px';
	}
	function popup(windowname) {
		blanket_size(windowname);
		window_pos(windowname);
		toggle('blanket');
		toggle(windowname);		
	}
	
	function switchPopup(closeThis, openThis)
	{
		popup(closeThis);
		popup(openThis);
	//onclick="switch('popUpPurse','popUpPurse_2')
	}