function zeigen(id) {
	  if (document.getElementById) {
		  document.getElementById(id).style.display="block";
		} else if (document.all) {
		  document.all[id].style.display="block";
		} else if (document.layers) {
		  document.layers[id].display="block";
		} } 

 function ablegen(id) {
	  if (document.getElementById) {
		  document.getElementById(id).style.display="none";
		} else if (document.all) {
		  document.all[id].style.display="none";
		} else if (document.layers) {
		  document.layers[id].display="none";
		} }