Display Product SKU ??

How do I display the "Product SKU" on the product details page?

Thanks
Henk

Edit:

templates\hot_drug_store\html\com_virtuemart\productdetails\default.php

to output SKU use:

<?php
echo $this->product->product_sku;
?>

I spent a day going through VM forums trying to resolve this and just got more and more fustrated. Just couldn't understand what they were referring to.

Five minutes after I got your reply I had it working as I wanted it. Not only are your templates great your support is awesome.

Thanks Heaps !!