function anzeigen(umenue, pos) {
var x1 = document.getElementById(umenue);
x1.style.top = pos;
x1.style.left = "138px";
} 

function zurueck(umenue) {
var x1 = document.getElementById(umenue);
x1.style.top = "-5000px";
x1.style.left = "138px"; 
}