function zeige(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 verberge(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";
} }