function MenuOn(x){
obj=document.getElementById
("submenu"+x).style.visibility="visible";
}

function MenuOff(x){
obj=document.getElementById
("submenu"+x).style.visibility="hidden";
}

function open_ritsumenzu(url){
 window.open(url,"window1","width=400,height=450,scrollbars=no,status=no,resizable=yes,toolbar=no,location=no,menubar=no");
}

function open_photo(url){
 window.open(url,"window2","width=600,height=400,scrollbars=no,status=no,resizable=yes,toolbar=no,location=no,menubar=no");
}