/**
  * Save data to cache storage and set cache lifetime equal with customer session lifetime
  *
  * @param string $data
  * @param string $id
  * @param array $tags
  */
 protected function _saveCache($data, $id, $tags = array(), $lifetime = null)
 {
     $lifetime = Mage::getConfig()->getNode(Mage_Core_Model_Session_Abstract::XML_PATH_COOKIE_LIFETIME);
     return parent::_saveCache($data, $id, $tags, $lifetime);
 }