function showLayer(id)
{
	var layerID = getElemRefs(id);
	if (layerID && layerID.css) layerID.css.visibility = "visible";
}
function hideLayer(id)
{
	var layerID = getElemRefs(id);
         if (layerID && layerID.css) layerID.css.visibility = "hidden";
}
function getElemRefs(id)
{
	var el = (document.getElementById)? document.getElementById(id): (document.all)? document.all[id]: (document.layers)? getLyrRef(id,document): null;
	if (el) el.css = (el.style)? el.style: el;
	return el;
}
function openFenster(link,fenster,weite,hoehe)
  {
  open(link,fenster,"width="+weite+",height="+hoehe+", resizable=yes,toolbar=no,scrollbars=yes");
  }