function popupWindow(file)
{
	offsetLeft = Math.floor((screen.width - 600) / 2);
	offsetTop = Math.floor((screen.height - 600) / 2);
	
	newWin = window.open(file, "osch", "height=600,width=600,directories=no,locationbar=no,menubar=no,resizable=no,status=no,scrolling=no");
	newWin.moveTo(offsetLeft, offsetTop);
}