var fenster;
  
function fenster_auf(fensterName) {
  fenster = open(fensterName ,"", "width=450, height=350, toolbar=no, scrollbars=no");
  }
 function fenster2_auf(fensterName) {
  fenster = open(fensterName ,"", "width=350, height=410, toolbar=no, scrollbars=no");
  }
  function fenster3_auf(fensterName) {
  fenster = open(fensterName ,"", "width=450, height=320, toolbar=no, scrollbars=no");
  }