<script type="text/javascript">
    function cleanUpFilename(filename) {
        var newFileName = filename;
        newFileName = newFileName.replace(new RegExp('[^A-Za-z0-9\\-_.ÄäÖöÜüß ]', 'g'), '');
        newFileName = newFileName.replace(new RegExp('Ä', 'g'), 'Ae');
        newFileName = newFileName.replace(new RegExp('ä', 'g'), 'ae');
        newFileName = newFileName.replace(new RegExp('Ö', 'g'), 'Oe');
        newFileName = newFileName.replace(new RegExp('ö', 'g'), 'oe');
        newFileName = newFileName.replace(new RegExp('Ü', 'g'), 'Ue');
        newFileName = newFileName.replace(new RegExp('ü', 'g'), 'ue');
        newFileName = newFileName.replace(new RegExp('ß', 'g'), 'ss');
        newFileName = newFileName.replace(new RegExp(' ', 'g'), '-');
    
        return newFileName;
    }
</script>