function invisible() {
document.getElementById("submenue1").style.visibility = "hidden";
document.getElementById("submenue2").style.visibility = "hidden";
document.getElementById("submenue3").style.visibility = "hidden";
document.getElementById("submenue4").style.visibility = "hidden";
}
function menue(i) {
invisible();
document.getElementById("submenue"+i).style.visibility = "visible";
}