WP E-Commerce: Moving between products?

I am working on a e-commerce website running on WP 3.6, and running the latest build of WP E-Commerce for the shopping feature. My client would like to have the ability to move from product to product without going back to the product gallery. For example, they would like to have a link on product A that moves to product B and so on. I have tried adding <?php posts_nav_link(); ?> to the page template without success as the links do not appear. I have checked the CCS and do not see anything that would be causing it not to display. Any help would be greatly appreciated!