// JavaScript Document
function onoff (which) {
  if (document.getElementById)
    document.getElementById(which).style.visibility = "visible";
   // document.getElementById("Zeile").style.visibility = "collapse";
}
function offon (which) {
  if (document.getElementById)
    document.getElementById(which).style.visibility = "hidden";
   // document.getElementById("Zeile").style.visibility = "collapse";
}