var F1= 0;
   
   function openpopup(datei){
        F1= open( datei,"Popup","width=600,innerheight=500,dependent=yes,resizable=yes,toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollBars=1,scrolling=auto");
        F1.focus();
    }
    function closepopup(){
        if(F1) F1.close();
    }