var fenster;
  
function fenster_auf(fensterName) {
  fenster = open(fensterName ,"", "width=500, height=500, toolbar=no, scrollbars=no");
  }
  function fenster2_auf(fensterName) {
  fenster = open(fensterName ,"", "width=420, height=293, toolbar=no, scrollbars=no");
  }