public function render(Varien_Object $row)
 {
     $currency = $row->getCurrency();
     if (!$currency) {
         $currency = Mage::app()->getStore()->getBaseCurrencyCode();
     }
     return Mage::getModel('directory/currency')->load($currency)->formatTxt($row->getTotalAmount());
 }
    public function render(Varien_Object $row)
    {
        return sprintf('
			%s', Mage::helper('core')->currency($row->getTotalAmount()));
    }