function excludeQA() {
        $string = " AND profiles.login_name NOT LIKE ";
        $addtoquery = "";
        $qa = array("'nathanm'", "'zhaopengy'", "'weedingn'", "'dalep'", "'andrewb'", "'conradm'", "'danield'", "'xinmingz'", "'huiqiangt'", "'lingquanh'", "'xiaojiax'", "'xieqian'", "'ziyuany'");

        foreach ($qa as $q) {
                $addtoquery = $addtoquery . $string . $q;
        }
        return $addtoquery;

}