/**
* Retrieve tracking url with params
*
* @param string $key
* @param Mage_Sales_Model_Order|Mage_Sales_Model_Order_Shipment|Mage_Sales_Model_Order_Shipment_Track $model
* @param string $method Optional - method of a model to get id
* @return string
*/
protected function _getTrackingUrl($key, $model, $method = 'getId')
{
$helper = Mage::helper('Mage_Core_Helper_Data');
$urlPart = "{$key}:{$model->{$method}()}:{$model->getProtectCode()}";
$param = array('hash' => $helper->urlEncode($urlPart));
$storeModel = Mage::app()->getStore($model->getStoreId());
return $storeModel->getUrl('shipping/tracking/popup', $param);
}