function open_chaiweb(page,w,h) {
if (!w) w="772";
if (!h) h="521";
in_fen=window.open(page,"chai","location=no,status=no,directories=no,toolbar=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width="+w+",height="+h);
in_fen.focus();
}