private function getDefaultOptions($start = null, $end = null)
    {
        if (!$start) {
            $start = (int)date('Y');
        }
        if (!$end) {
            $end = 1900;
        }
        $years = array();
        for ($i=$start; $i>=$end; $i--) {
            $years[$i] = $i;
        }
        return $years;
    }