function OpenWin2() { 
window_location=window.open('http://ueno.cool.ne.jp/dulfer/gllry_vier/index.htm','prvwin','toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=468,height=500');
window_location.focus();
}

function OpenWin3() { 
window_location=window.open('http://ueno.cool.ne.jp/dulfer/gllry_sechzehn/index.htm','prvwin','toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=468,height=500');
window_location.focus();
}