function toggleVisibility(nr)
{
 elem = document.getElementById("menue2");
 if (nr==1) elem.style.visibility="visible";
 if (nr==0) elem.style.visibility="hidden";
 if (nr==2)
 {
  if (elem.style.visibility="hidden") elem.style.visibility="visible";
                                 else elem.style.visibility="hidden";
 }
 if (nr>10)
 {
  setTimeout("toggleVisibility(0)",nr);
 }
}