GOT IT!!
This works in 4.1.9. UPDATED-=> Also works in 4.1.10
PHP Code:
{*Manufacturer Logo*}
{if $products[product].manufacturerid ne 0}
<br />
<div align="center">
<a href="manufacturers.php?manufacturerid={$products[product].manufacturerid}"><img src="image.php?id={$products[product].manufacturerid}&type=M">
</a></div>
{/if}
{*Manufacturer Logo*}