function popUp(URL) {
	day = new Date();
	id = day.getTime();
	width = 570;
	height = 500; 
	leftVal = (screen.width - width)/2;
	topVal = (screen.height - height)/2;
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=1,resizable=0,width="+ width +",height="+ height +", left="+ leftVal +", top="+ topVal +"');");
}