// Anzahl Fragen
   var nb_questions = 6;
   var i, question, label_question;
   function Calcul(form)
   {
      var champ_total = document.forms['essai'].elements['TOTAL'];
      var tot = 0;
      for (i = 1; i <= nb_questions; i++)
      {
         var question = document.forms['essai'].elements['Q'+i];
         tot += parseInt(question.options[question.selectedIndex].value);
      }
      champ_total.value = tot;
   }

function onoff () {
  if (document.getElementById)
    document.getElementById("Ueberschrift").style.visibility = "visible";
    document.getElementById("Zeile").style.visibility = "collapse";
}