// function for checking trail products
	public function checkTrialProduct($observer)
	{
		error_log('coming in trail function');
		$getValues = array();
		$getValues[0] = '';
		$getValues[1] = '';
		$getValues[2] = '';
		$customerId = Mage::getSingleton('customer/session')->getCustomerId();
		$salesCollection = Mage::getModel('sales/order')
			    ->getCollection()
			    ->addAttributeToSelect('entity_id')
			    ->addAttributeToSelect('customer_id')
			    ->addFieldToFilter('customer_id', $customerId)
			    ->addOrder('created_at', 'desc')
			    ->addAttributeToSelect('*')
			    ->load();
		// if trial product is exist in previous orders
		if(count($salesCollection))
		{

			$order = $observer->getEvent()->getOrder();
			foreach ($order->getAllItems() as $item)
			{

				$prdEntyId = $item->getData("product_id");
				$product = Mage::getModel('catalog/product')->load($prdEntyId);
				$prdAtrSetId = $product->getData("attribute_set_id");
				$trailOption = $product->getData("trialsubsription");
				$subLength = $product->getData("subscriptionlength");
				foreach($salesCollection as $_myorder)
				{
					$getValues[1]['orderid'] = $_myorder->getId();
			  		$getValues[2]['expiredate'] = $_myorder->getData('expirationdate');
			  		$expdate = $getValues[2]['expiredate'];
			        foreach ($_myorder->getAllItems() as $itemId => $oldOrderItem)
			        {
			        	$getValues[0]['productid']=$oldOrderItem->getProductId();
			        	if($prdEntyId == $getValues[0]['productid'] && $trailOption == '1')
						{
							throw new Exception("You can add the trial product only once");

						}

					}
				}
	  		}

	  	}
		else
		{
			// insert as a new records...
			$order = $observer->getEvent()->getOrder();
    		$k=0;
			foreach ($order->getAllItems() as $item)
			{

				$prdEntyId = $item->getData("product_id");
				$product = Mage::getModel('catalog/product')->load($prdEntyId);
				$prdAtrSetId = $product->getData("attribute_set_id");
				$trailOption = $product->getData("trialsubsription");
				$subLength = $product->getData("subscriptionlength");
				if($prdAtrSetId == '32' && $trailOption == '1')
						{
							$expiryDate = date('Y-m-d H:i:s', mktime(0, 0, 0, date("m") , date("d") + $subLength , date("Y")));
							$observer->getEvent()->getOrder()->setExpirationdate($expiryDate);
							$observer->getEvent()->getOrder()->setTrialsubsription($trailOption);
							$order->save();
						}
			}
		}


	}