var InstanzID; // Falls mehrere Navigationen im selben Menü auftreten
    var MenID;
    var CurMen;
//    var openMenu=-1;
    var openMenu=new Array(-1,-1,-1);
    function closeMenu(InstanzID)
      {
        if(openMenu[InstanzID]!=-1)
          {
            CurMen=document.getElementById("Men_"+InstanzID+"_"+openMenu[InstanzID]);
            CurMen.style.display="none";
            openMenu[InstanzID]=-1;
          }
      }
    function newMenu(MenID,InstanzID)
      {
        closeMenu(InstanzID);
        openMenu[InstanzID]=MenID;
        CurMen=document.getElementById("Men_"+InstanzID+"_"+MenID);
        CurMen.style.display="block";
      }
    function Menu(MenID,InstanzID)
      {
        if(openMenu[InstanzID]==MenID)
          {
            closeMenu(InstanzID);
            return false;
          }
        else
          {
            newMenu(MenID,InstanzID);
            return true;
          }
      }