var t;
  function fixheight() {
   var maxH = 0;
   var ids = ["contentblock","quicknav_block","quicknav"];
   // maximale Höhe finden
   for (var i=0;i<ids.length;i++) {
    var d = document.getElementById(ids[i]);
    //alert (d.id+" : "+d.offsetHeight);
    d.style.height = ""; // Höhe auf 0 setzen
    if (d.offsetHeight > maxH) maxH = d.offsetHeight;
   }
   // maximale Höhe bei allen Divs setzen
   for (var i=0;i<ids.length;i++) {
    var d=document.getElementById(ids[i]);
    d.style.height = maxH+"px";
   }
  }