function popup_window(url) {
 	PopupWnd = 
	window.open(url,'','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes');
}

function popup_window(url,width,height) {
 	PopupWnd = 
	window.open(url,'','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width='+width+',height='+height);
}