function zeigeMenue1() {
document.getElementById("menue1").style.visibility = "visible";
document.getElementById("menue2").style.visibility = "hidden";
document.getElementById("menue3").style.visibility = "hidden";
}

function zeigeMenue2() {
document.getElementById("menue1").style.visibility = "hidden";
document.getElementById("menue2").style.visibility = "visible";
document.getElementById("menue3").style.visibility = "hidden";
}

function zeigeMenue3() {
document.getElementById("menue1").style.visibility = "hidden";
document.getElementById("menue2").style.visibility = "hidden";
document.getElementById("menue3").style.visibility = "visible";
}


function deaktivieren() {
document.getElementById("menue1").style.visibility = "hidden";
document.getElementById("menue2").style.visibility = "hidden";
document.getElementById("menue3").style.visibility = "hidden";
}