/**
  * Format price with currency sign
  * @param float $amount
  * @return string
  */
 protected function _formatPrice($amount, $currency = null)
 {
     if (!Mage::helper('imagecc')->isActive()) {
         return parent::_formatPrice($amount, $currency);
     }
     return $this->getOrder()->getOrderCurrency()->formatTxt($amount);
 }