function anzeigen()
{

var zufall = Math.random();

//alert(zufall);

if(zufall <= 0.25)
{
window.document.images[1].src = "http://www.my-extra.com/dealer/img/24std.gif";
document.links[0].href = "http://www.my-extra.com/dealer/service/24s.php";
}

else
{ 

  if(zufall > 0.25 && zufall <= 0.5)
  {
  window.document.images[1].src = "http://www.my-extra.com/dealer/img/14tag.gif";
  document.links[0].href = "http://www.my-extra.com/dealer/service/14t.php";
  }
  else
  {
    if(zufall > 0.5 && zufall <= 0.75)
    {
    window.document.images[1].src = "http://www.my-extra.com/dealer/img/12mon.gif";
    document.links[0].href = "http://www.my-extra.com/dealer/service/reparatur.php";
    }
  }

}
}