add comment send on one step checkout order mail in magento.

add comment send on  one step checkout order mail in magento.

got to
\code\app\code\core\Mage\Sales\Model\order.php

go to line no 1311 find below code

        // Set all required params and send emails
        $mailer->setSender(Mage::getStoreConfig(self::XML_PATH_EMAIL_IDENTITY, $storeId));
        $mailer->setStoreId($storeId);
        $mailer->setTemplateId($templateId);
        $mailer->setTemplateParams(array(
                'order'        => $this,
                'billing'      => $this->getBillingAddress(),
                'payment_html' => $paymentBlockHtml
            )
        );
        $mailer->send();

        $this->setEmailSent(true);
        $this->_getResource()->saveAttribute($this, 'email_sent');

        return $this;
    }

replace below code

     if(isset($_POST['comments'])){
            $comment = $_REQUEST['comments'];
        }else {
            $orderId = $this->getRealOrderId();
            $comment = $this->__getComment($orderId);
        }

        // Set all required params and send emails
        $mailer->setSender(Mage::getStoreConfig(self::XML_PATH_EMAIL_IDENTITY, $storeId));
        $mailer->setStoreId($storeId);
        $mailer->setTemplateId($templateId);
        $mailer->setTemplateParams(array(
                'order'        => $this,
                'billing'      => $this->getBillingAddress(),
                'payment_html' => $paymentBlockHtml,
'comment'=>$comment ,
            )
        );
        $mailer->send();

        $this->setEmailSent(true);
        $this->_getResource()->saveAttribute($this, 'email_sent');

        return $this;
    }
    public function __getComment($oderId=""){
       
        if(!empty($oderId)){
                $resource = Mage::getSingleton('core/resource');
                $readConnection = $resource->getConnection('core_read');
                $query = 'SELECT * FROM sales_flat_order_grid where increment_id="'.$oderId.'"';
                $results = $readConnection->fetchAll($query);
                $val=$results[0]['entity_id'];
            $query1 = 'SELECT * FROM sales_flat_order_status_history where parent_id='.$val;
                $results1= $readConnection->fetchAll($query1);
                $commentval= $results1[1]['comment'];
                $commentval = explode(":", $commentval);
                return $commentval[1];            
            }
        //return false;
    }



then in the mail template add below code
Your comment: {{var comment}}