function MenuOn_gakubu(){
         obj=document.getElementById("sm_gakubu").style.visibility="visible";
}
function MenuOff_gakubu(){
         obj=document.getElementById("sm_gakubu").style.visibility="hidden";
}
function MenuOn_daigakuin(){
         obj=document.getElementById("sm_daigakuin").style.visibility="visible";
}
function MenuOff_daigakuin(){
         obj=document.getElementById("sm_daigakuin").style.visibility="hidden";
}