function closeall() {
      monate = new Array("januar", "februar", "maerz","april","mai","juni","juli","august","september","oktober","november","dezember");
      for (var i = 0; i < monate.length; ++i) {
         if ( document.getElementById(monate[i])) {
            document.getElementById(monate[i]).style.display='none';
         }
      }
   }

   function opendiv(divname) {
      closeall();
      document.getElementById(divname).style.display='inline';
   }

   function openall() {
      monate = new Array("januar", "februar", "maerz","april","mai","juni","juli","august","september","oktober","november","dezember");
      for (var i = 0; i < monate.length; ++i) {
         if ( document.getElementById(monate[i])) {
            document.getElementById(monate[i]).style.display='inline';
         }
      }
   }
 
  function closediv(divname) {
      document.getElementById(divname).style.display='none';
   }