WP e-Commerce "Buy" buttons

[Ryan]

Any ideas why the "Buy" buttons on the home page of this site aren't working? They redirect to the shopping cart, but aren't adding anything to the cart :( The buttons on the single product pages are working fine, just not the ones on the home page.
http://demo.pixopoint.com/itlaw/

[Ryan]

Thanks to Jeff Ghazally, I now know that my problem was that I had an empty form :P All it had was a submit button!

Sometimes the solutions are the simplest ones :) I added the necessary fields and it works fine now :)