public static function config($index = array(), $value = null)
	{
		if (static::$_instance === null)
		{
			if ($value !== null)
				$index = array($index => $value);
			if (is_array($index))
				static::$_config = array_merge(static::$_config, $index);
			static::instance();
			return static::instance();
		} else {
			return static::instance()->config($index, $value);
		}
	}