function returnquiz(fenstername) {
     var aktuellesfenster = window.name;
     var win = window.open(fenstername,"Fenster1","width=740,height=440,left=60,top=50,dependent=yes, resizeable=yes, scrollbars=yes, menubar=no, toolbar=no");
      if (aktuellesfenster != "Fenster1") {
             if (! win.ontop) {
               win.focus();
             }
      }
}