public function render(Varien_Object $row) { if (file_exists($row->getMainPath())) { $downloadUrl = Mage::helper('adminhtml')->getUrl('amfeed/adminhtml_profile/download', array('file' => $row->getFilename() . $row->getFileExt())); return '<a href="' . $downloadUrl . '">' . $row->getFilename() . '</a>'; } else { return $row->getFilename(); } }