function popup_window(url) {
	  parent_window = this;
	  admin_win = window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width=800,height=600,screenX=100,screenY=150,top=150,left=100');
	  window.admin_win.focus();
	}