function sichtbarmachen(ebenenname) {
elements = document.getElementsByTagName("div");
for (x=0;x<elements.length;x++)
elements[x].className = "inactive";

document.getElementById(ebenenname).className = "active";
}


function toggledisplay (id){
  if (document.getElementById) {
    var mydiv = document.getElementById(id);
    mydiv.style.display = (mydiv.style.display=='block'?'none':'block');
  }
}