public static function showThankYouMessage($formId)
 {
     $mainframe = JFactory::getApplication();
     $output = '';
     $formId = (int) $formId;
     $db = JFactory::getDBO();
     $db->setQuery("SELECT ThemeParams FROM #__rsform_forms WHERE FormId='" . $formId . "'");
     $form = $db->loadObject();
     if ($form->ThemeParams) {
         RSFormProHelper::loadTheme($form);
     }
     $doc = JFactory::getDocument();
     $doc->addStyleSheet(JURI::root(true) . '/components/com_rsform/assets/css/front.css');
     if ($doc->getDirection() == 'rtl') {
         $doc->addStyleSheet(JURI::root(true) . '/components/com_rsform/assets/css/front-rtl.css');
     }
     $session = JFactory::getSession();
     $formparams = $session->get('com_rsform.formparams.' . $formId);
     $output = base64_decode($formparams->thankYouMessage);
     // Clear
     $session->clear('com_rsform.formparams.' . $formId);
     //Trigger Event - onAfterShowThankyouMessage
     $mainframe->triggerEvent('rsfp_f_onAfterShowThankyouMessage', array(array('output' => &$output, 'formId' => &$formId)));
     // Cache enabled ?
     jimport('joomla.plugin.helper');
     $cache_enabled = JPluginHelper::isEnabled('system', 'cache');
     if ($cache_enabled) {
         RSFormProHelper::cleanCache();
     }
     return $output;
 }