public function paintHeader($test_name)
        {
            $this->sendNoCacheHeaders();
            echo sprintf(
                SIMPLETEST_WEBUNIT_HEAD, $test_name, $this->path . 'js/', $this->path . 'js/', $this->path . 'css/', $this->_getCss(), $test_name, $this->path . 'img/'
                );
            flush();
        }