// Aufklappmenue fuer IE
function navi() {
  if (document.all&&document.getElementById) {
    navRoot = document.getElementById('mainmenu');
    for (i=0; i<navRoot.childNodes.length; i++) {
      node = navRoot.childNodes[i];
      if (node.nodeName=="LI") {
        node.onmouseover=function() {
          this.className+=" over";
        }
        node.onmouseout=function() {
          this.className=this.className.replace(" over", "");
        }
      }
    }
  }
}

function zeige(ebene)
{
  if (document.layers)
    document.layers[ebene].visibility = "visible";
  if (document.all)
    document.all[ebene].style.visibility = "visible";
  if (document.getElementById)
   document.getElementById(ebene).style.visibility = "visible";  
}

function verstecke(ebene)
  {
  if (document.layers)
    document.layers[ebene].visibility = "hidden";
  if (document.all)
    document.all[ebene].style.visibility = "hidden";
  if(document.getElementById)
   document.getElementById(ebene).style.visibility = "hidden";
  }