function menueEnter() {
  alert('Hallo Welt');
  document.all.zelle1.style.display = "block";
  //document.all.zelle2.style.display = "block";
  //document.all.zelle3.style.display = "block";
  //document.all.zelle4.style.display = "block";
}


function menueLeave() {
  alert('Hallo Welt');
  //document.all.Zeile1.style.display = "block";
  //document.all.Zeile2.style.display = "block";
  //document.all.Zeile3.style.display = "block";
  //document.all.Zeile4.style.display = "block";
}