private function usernameOrEmailAlreadyTaken($viewname, $module, $css)
 {
     if (parent::findUsername($_POST["username"])) {
         $username_taken = true;
     }
     if (parent::findEmail($_POST["email"])) {
         $email_taken = true;
     }
     if (parent::findEmail($_POST["email"]) || parent::findUsername($_POST["username"])) {
         $view = new View($viewname, $module, $css);
         $view->generate(array('email_taken' => $email_taken, 'username_taken' => $username_taken));
         $this->cleanPOST();
         die;
     }
 }