function menuOn(x){
obj=document.getElementById("submenu"+x).style.visibility="visible";
obj=document.getElementById("submenu"+x).style.position="relative";
obj=document.getElementById("submenu"+x).style.height="40px";
}

function menuOff(x){
obj=document.getElementById("submenu"+x).style.visibility="hidden";
obj=document.getElementById("submenu"+x).style.position="absolute";
obj=document.getElementById("submenu"+x).style.height="0px";
}