Here is a little something to use on template/catalog/product/view.phtml page. I got few inquiries on how to get the “in_stock” status of a product. Here is a working sample code that shows different messages when and if the product is in stock or out of stock.
<?php // Check to see if the item is in stock
if($_product->stock_item->is_in_stock == 1):
echo $this->__('Availability') ?>:<strong><?php echo $this->__('In stock') ?></strong>
?>
<?php else:?>
<strong><a href="<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_WEB) ?>contacts/" title="<?php echo $this->__('Email') ?>"><?php echo $this->__('Email') ?></a></strong>
<?php echo $this->__('or Call for Availability') ?> 1-222-333-444
<?php endif; ?>
来源:http://inchoo.net/magento/user-friendly-product-availability-message-in-magento/