drupal - override form action

function avene_global_form_alter(&$form, $form_state, $form_id) {
  switch ($form_id) {
      case 'webform_client_form_1':
          // unset($form['#action']);
          $form['#action'] = 'http://www.eau-thermale-avene.cn' . $form['#action'];
          array_push($form['#submit'], 'contactus_alert');    
        break;
      case 'newsletter_subscribe_form':
          $form['#action'] = 'http://www.eau-thermale-avene.cn' . $form['#action'];
        break;
      case 'care_search_form':
          $form['#action'] = 'http://www.eau-thermale-avene.cn' . $form['#action'];
        break;
      case 'avene_arrimable_shoppe_search_form':
          $form['#action'] = 'http://www.eau-thermale-avene.cn' . $form['#action'];
        break;

  }
}