public function antispam($form_dom_id)
    {
        $salt  = isset($this->_View->viewVars['_alaxos_spam_filter_salt']) ? $this->_View->viewVars['_alaxos_spam_filter_salt'] : null;
        $token = SecurityTool::get_today_token($salt);

        /*
         * Unlock hidden field added by JS to prevent blackholing of form
         */
        $fieldname = SecurityTool::get_today_fieldname($salt);
        $this->unlockField($fieldname);

        return $this->AlaxosHtml->script(Router::url(['prefix' => false, 'plugin' => 'Alaxos', 'controller' => 'Javascripts', 'action' => 'antispam', '_ext' => 'js', '?' => ['fid' => $form_dom_id, 'token' => $token]], true), ['block' => true]);
    }