function changeRubric() {
  var target = document.nav_form.hauptnavi.options[document.nav_form.hauptnavi.selectedIndex].value;
  if (target != "") document.location.href = target;
}

function openPdf(pfad){
 window.open(pfad,'pdfwin','width=750,height=550,scrollbars=yes,resizable=yes')
}