Capcha. Динамическое обновление

function mymodule_menu() {
   $items['image_captcha/refresh'] = array(
   'type' => MENU_CALLBACK,
   'access arguments' => array('access content'),
   'page callback' => '_mymodule_image_captcha_reload',
   );
   return $items;
}
 
function _mymodule_image_captcha_reload($form_id, $captcha_token) {
   $result = image_captcha_captcha('generate', 'Image');
   $_SESSION['captcha'][$form_id][$captcha_token] = $result['solution'];
   die($result['form']['captcha_image']['#value']);
}
 
function mymodule_form_alter(&$form, $form_state, $form_id) {
   if (isset($form['captcha']['captcha_image'])&&isset($form['captcha']['captcha_response'])) {
      $form['captcha']['captcha_image']['#prefix'] = '<div id="captcha_reloader"><a href="'.$_SERVER['REQUEST_URI'].'" onclick="'.($onclick = '$(\'#captcha_reloader a\').load(\''.url('image_captcha/refresh/'.$form_id.'/'.$form['captcha']['captcha_token']['#value']).'\');return false;').'">';
      $form['captcha']['captcha_image']['#suffix'] ='</a></div>Нифига непонятно?<button onClick="'.$onclick.'">сменить картинку</button>';
   }
}