var fenster;
  
function fenster_auf(fensterName) {
  fenster = open(fensterName ,"", "width=640, height=320, toolbar=no, scrollbars=no");
  }
function fenster2_auf(fensterName) {
  fenster = open(fensterName ,"", "width=320, height=640, toolbar=no, scrollbars=no");
  }
function fenster3_auf(fensterName) {
  fenster = open(fensterName ,"", "width=640, height=480, toolbar=no, scrollbars=no");
  }
function fenster4_auf(fensterName) {
  fenster = open(fensterName ,"", "width=480, height=320, toolbar=no, scrollbars=no");
  }