function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function submitForm()
{
  // document.getElementById("formularziel").contentDocument.location.reload(true);
  // parent.frames["formularziel"].window.location.reload();
  // window.frames["formularziel"].reload(false);

  var f = document.getElementById('formularziel');
  var name = document.getElementById('Name').value;
  var telefon = document.getElementById('Fon').value;
  
  if (name == '' || telefon == '')
  {
    alert("Bitte füllen Sie beide Felder aus.");
  }
  else
  {  
    f.src = "index.php?id=123&name=" + name + "&telefon=" + telefon;  
    toggleLayer("rueckruf");
    toggleLayer("danke");
  }
}