protected function _parseRelativePathCss($m) {
        /**
         * We take the page. Each time we have a '../' in a path file in the css, we drop a folder of the parent file. Zxample :
         *   css file : css/dossier/truc/test.css
         *   image file in css : ../../test.png
         *   we have two ../ so we delete two folder : css/test/test.png
         */

        $pathReplace = '';

        if (!preg_match('~(?:f|ht)tps?://~i', $m[1]) && !preg_match('~(data)~i', $m[1])) {
            //we clear the '/' at the beginning
            $m[1] = preg_replace("#^/#isU", '', $m[1]);
            $m[1] = str_replace('"', '', $m[1]);
            $m[1] = str_replace("'", '', $m[1]);
            $this->_currentPath = preg_replace("#^/#isU", '', $this->_currentPath);

            //on count the number of '../'
            $numberParentDir = substr_count($m[1], '../');

            if ($numberParentDir > 0) {
                for ($i = 0; $i < $numberParentDir; $i++) {
                    $pathReplace .= '(.[^\/]+)\/';
                }

                $pathReplace .= '$';
                $newCurrentPath = preg_replace('#' . $pathReplace . '#isU', '/', $this->_currentPath);
                $m[1] = preg_replace('#\.\./#isU', '', $m[1]);

                if ($newCurrentPath != $this->_currentPath) {
                    $m[1] = $newCurrentPath . $m[1];
                }
                else if (!preg_match('#^' . preg_quote($newCurrentPath) . '#isU', $m[1])) {
                    if (!preg_match('#^/asset#isU', $m[1]) && !preg_match('#^asset#isU', $m[1])) {
                        $m[1] = $newCurrentPath . $m[1];
                    }
                }
            }

            if (!preg_match('#^/#isU', $m[1])) {
                $m[1] = '/' . $m[1];
            }

            if (Config::config()['user']['output']['https']) {
                return 'https://' . str_replace('//', '/', $_SERVER['HTTP_HOST'] . '/' . Config::config()['user']['framework']['folder'] . $m[1]);
            }
            else {
                return 'http://' . str_replace('//', '/', $_SERVER['HTTP_HOST'] . '/' . Config::config()['user']['framework']['folder'] . $m[1]);
            }
        }
        else {
            return $m[1];
        }
    }