if (document.layers)  {
ns4 = 1; ns6 = 0; ie = 0;
}
else if (document.all) {
ns4 = 0; ns6 = 0; ie = 1;
}
else if (document.getElementById) {
ns4 = 0; ns6 = 1; ie = 0;
}

var z = 1;
var ebene = "Ebene";
function zeigeText(Nr){
verbergen(eval('"' + ebene + z +'"'));
zeigen(eval('"' + ebene + Nr +'"'));
z = Nr; 
}

function zeigen(name) {
if (ns4) {
document.layers[''+name].visibility = "show";               
}
else if (ie) {
document.all[''+name].style.visibility = "visible"
}
else if (ns6) {
document.getElementById(''+name).style.visibility = "visible"
}
}

function verbergen(name) {
if (ns4){
document.layers[''+name].visibility = "hide"
}
else if (ie) {
document.all[''+name].style.visibility = "hidden"
}
else if (ns6) {
document.getElementById(''+name).style.visibility = "hidden"
}
}