function open_win (theURL,theName,theWidth,theHeight,theScroll) {

        ///// Scrolling on oder off?
        var tempScrollStr = 'scrollbars=yes,';
        if ((theScroll != null) && (theScroll == false)) { tempScrollStr = ''; }

        ///// Parameter String erstellen und Fenster oeffnen
        var tempParamStr = 'toolbar=no,location=no,status=no,menubar=no,' + tempScrollStr + 'width=' + theWidth + ',height=' + theHeight;
        var tempWin = window.open (theURL, theName, tempParamStr);
        tempWin.focus();

        return true;
        }