function menu(Divname) {
    document.getElementById("DropBox").style.visibility = "visible";
    document.getElementById(Divname).style.visibility = "visible";
    document.getElementById(Divname+"box").style.visibility = "visible";
}

function closemenu(Divname) {
    document.getElementById("DropBox").style.visibility = "hidden";
    document.getElementById(Divname).style.visibility = "hidden";
    document.getElementById(Divname + "box").style.visibility = "hidden";
}