function gra02_init()
 {
  var i;
  for (i = 9; i < 15; i++)
  {
   //Felder initialisieren
   window.document.forms[0].elements[i].value = "";
  }

   for (i = 0; i < 4; i++)
  {
   //OperatorButtons checken
   if(window.document.forms[0].elements[i].checked == true)
   {
    operator = operatorvorgabe[i];
   }
  }

   for (i = 4; i < 9; i++)
   {
    //LevelButtons checken
    if(window.document.forms[0].elements[i].checked == true)
    {
     level = levelvorgabe[i-4];
    }
   }

   if(window.document.forms[0].elements[16].checked == true)
    {
     timer = true;
    }
   else
    {
     timer = false;
    }
   //window.document.forms[0].elements[14].value = ("operator "+operator +"level "+level +"timer ",+timer);

   ergebnis = ber_gra02();
   start = true;
   zaehler = 1;
   punkte = 0;
   window.document.forms[0].elements[9].value = (aufgabentyp +"  Level "+level);
   window.document.forms[0].elements[10].value = zaehler;
   window.document.forms[0].elements[11].value = (a +" " +operator +" " +b);
   //Fokus auf Eingabefeld setzen
   window.document.forms[0].elements[12].focus();
 }