if(navigator.appName.indexOf("Netscape") > -1 && 
navigator.appVersion.substr(0,1) <= "4")
 parent.location.href="netscape.html";

function show1 () {
  if (document.getElementById)
    document.getElementById("bild1").style.visibility = "visible";
}

function hidden1 () {
  if (document.getElementById)
    document.getElementById("bild1").style.visibility = "hidden";
}

function show2 () {
  if (document.getElementById)
    document.getElementById("bild2").style.visibility = "visible";
}

function hidden2 () {
  if (document.getElementById)
    document.getElementById("bild2").style.visibility = "hidden";
}

function show3 () {
  if (document.getElementById)
    document.getElementById("bild3").style.visibility = "visible";
}

function hidden3 () {
  if (document.getElementById)
    document.getElementById("bild3").style.visibility = "hidden";
}

function show4 () {
  if (document.getElementById)
    document.getElementById("bild4").style.visibility = "visible";
}

function hidden4 () {
  if (document.getElementById)
    document.getElementById("bild4").style.visibility = "hidden";
}

function show5 () {
  if (document.getElementById)
    document.getElementById("formularfeld").style.visibility = "visible";
}

function hidden5 () {
  if (document.getElementById)
    document.getElementById("formularfeld").style.visibility = "hidden";
}

function swap(bildname,tauschbild)
{
document.images[bildname].src=tauschbild;
}