public static function thumbnail($content, $htmlOptions = array())
    {
        $itemOptions = TbArray::popValue('itemOptions', $htmlOptions, array());
        self::addCssClass('thumbnail', $htmlOptions);
        $output = self::openTag('li', $itemOptions);
        $output .= self::tag('div', $htmlOptions, $content);
        $output .= '</li>';
        return $output;
    }