var state = 'none';

function showhide(layer_ref) {

if (state == 'block') {
state = 'none';
}
else {
state = 'block';
}
if (document.all) { //IS IE 4 or 5 (or 6 beta)
eval( "document.all." + layer_ref + ".style.display = state");
}
if (document.layers) { //IS NETSCAPE 4 or below
document.layers[layer_ref].display = state;
}
if (document.getElementById &&!document.all) {
hza = document.getElementById(layer_ref);
hza.style.display = state;
}
}

var pop = null;

function popdown() {
  if (pop && !pop.closed) pop.close();
}

function popup(obj,w,h) {
  var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href;
  if (!url) return true;
  w = (w) ? w += 20 : 150;  // 150px*150px is the default size
  h = (h) ? h += 25 : 150;
  var args = 'width='+w+',height='+h+',resizable';
  popdown();
  pop = window.open(url,'',args);
  return (pop) ? false : true;
}

function oeffnefenster (url) {
 fenster = window.open(url, "fenster1", "width=640,height=480,status=no,scrollbars=yes,resizable=yes");
 fenster.focus();
}
function popUp1(wintype)
{
  var nwl = (screen.width-640)/2;
  var nwh = (screen.height-480)/2;
  popUp=window.open(wintype, 'anfrage1', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=640,height=480,left='+nwl+',top='+nwh+'');
  popUp.window.focus();
}