protected static function _renderImage($src, $className, array $attributes = array())
        {
            if (is_array($attributes['class'])) {
                $attributes['class'][] = $className;
            } else {
                $attributes['class'] .= ' ' . $className;
            }

            return sprintf('<img src="%s"%s />', Html::escape($src), Html::attributes($attributes));
        }