[TYPO3-commerce] Adding attributes to Link ###PRODUCT_LINK_DETAIL###

[Wild Wild Web - Internetservices]

Hello,

trying to implement the 'lightbox for content elements' extension 
/rgmoodalbox/
to display product details pages as a lightbox by clicking the 
corresponding
link in the product list. The marker is ###PRODUCT_LINK_DETAIL###.

For this link to work with the rgmoodalbox the a tag has to get an 
additional
attribute rel="moodalbox" so the link looks like that:
<a href="http://www.domain.com/index.php?..." rel="moodalbox">more info</a>

My question: How to add this attribute to the link?

regards
Heiko