function popWindow(url, w, h)
{
	var l = (screen.width / 2) - (w / 2);
	var t = (screen.height / 2) - (h / 2);
	
	var win = window.open(url, 'Popup', 'width='+w+',height='+h+',left='+l+',top='+t+',resizable=0,scrollbars=yes,menubar=no');
}