function openWindow(url, width, height) {
	var leftVal, left, topVal, top;
	
	if (!width) {
		//width = 780;
		width = screen.width;
	}
	if (!height) {
		//height = 500;
		height = screen.height;
	}
	leftVal = (screen.width / 2) - (width / 2);
	topVal = (screen.height / 2) - (height / 2);
	left = ", left=" + leftVal;
	top = ", top=" + topVal;
	width = ", width=" + width;
	height = ", height=" + height;
	winOptions = 'toolbar=no, directories=no, location=no, status=yes, menubar=no, resizable=no, scrollbars=yes'+ left + top + width + height;
	window.open(url, 'popWin', winOptions);
}