var opensubmenu='submenu_buergerradio';

function findTop(e)
  {
    var t=0;
    if (e.offsetParent)
      {
        while (e.offsetParent)
          {
            t+=e.offsetTop
            e=e.offsetParent;
          }
      }
    else
      if (e.y)
        t+=e.y;
    return t;
  }

function showSubMenu(id)
  {
    if (id!=null)
      {
        opensubmenu='submenu_'+id;
        document.getElementById(opensubmenu).style.top=findTop(document.getElementById(id))+13;
      }
    document.getElementById(opensubmenu).style.visibility='visible';
  }

function hideSubMenu()
  {
    document.getElementById(opensubmenu).style.visibility='hidden';
  }