function zeigespalte1() {
    document.getElementById("spalte1").style.visibility = "visible";
    document.getElementById("spalte2").style.visibility = "hidden";
    document.getElementById("spalte3").style.visibility = "hidden";
    document.getElementById("spalte4").style.visibility = "hidden";
}
function zeigespalte2() {
    document.getElementById("spalte1").style.visibility = "hidden";
    document.getElementById("spalte2").style.visibility = "visible";
    document.getElementById("spalte3").style.visibility = "hidden";
    document.getElementById("spalte4").style.visibility = "hidden";
}
function zeigespalte3() {
    document.getElementById("spalte1").style.visibility = "hidden";
    document.getElementById("spalte2").style.visibility = "hidden";
    document.getElementById("spalte3").style.visibility = "visible";
    document.getElementById("spalte4").style.visibility = "hidden";
}
function zeigespalte4() {
    document.getElementById("spalte1").style.visibility = "hidden";
    document.getElementById("spalte2").style.visibility = "hidden";
    document.getElementById("spalte3").style.visibility = "hidden";
    document.getElementById("spalte4").style.visibility = "visible";
}
function loeschen() {
    document.getElementById("spalte1").style.visibility = "hidden";
    document.getElementById("spalte2").style.visibility = "hidden";
    document.getElementById("spalte3").style.visibility = "hidden";
    document.getElementById("spalte4").style.visibility = "hidden";
}