protected function _filterAsset(CakeEvent $event) {
		$url = $event->data['request']->url;
		$response = $event->data['response'];
		$filters = Configure::read('Asset.filter');
		$isCss = (
			strpos($url, 'ccss/') === 0 ||
			preg_match('#^(theme/([^/]+)/ccss/)|(([^/]+)(?<!css)/ccss)/#i', $url)
		);
		$isJs = (
			strpos($url, 'cjs/') === 0 ||
			preg_match('#^/((theme/[^/]+)/cjs/)|(([^/]+)(?<!js)/cjs)/#i', $url)
		);

		if (($isCss && empty($filters['css'])) || ($isJs && empty($filters['js']))) {
			$response->statusCode(404);
			return $response;
		}

		if ($isCss) {
			include WWW_ROOT . DS . $filters['css'];
			return $response;
		}

		if ($isJs) {
			include WWW_ROOT . DS . $filters['js'];
			return $response;
		}
	}