I'm using VirtueMart 2.0.18.a and theme930 for a client Joomla site (version 2.5.8). The cart seems to be working but the Add to Cart button doesn't respond. Any ideas about what might be preventing this from working properly? Thanks in advance.

Here is the link: jacquisouthphotography.com/joomla/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=28&virtuemart_category_id=5&Itemid=177