function popup(pagename, w, h) { 
	if (!w) {
		w = 500;
		}
	if (!h) {
		h = 400;
		}
	popupWindow = window.open(pagename,"popup","toolbar=yes,width=" + w + ",height=" + h + ",directories=no,status=no,scrollbars=yes,resizable=yes,menubar=no");
	popupWindow.focus();
}