title: Add to cart button not working in Magento
body: <p>The add to cart button on my website is not working. Here is an example page: <a href="http://www.fluffyflump.co.uk/pot-of-gold-art-print" rel="nofollow">http://www.fluffyflump.co.uk/pot-of-gold-art-print</a></p>
  
  <p>When click inspect element and console I can see the error: Cannot call method 'submit' of undefined</p>
  
  <p>The setup is Magento 1.7.0.2 and a custom theme which I have used before with no problems.</p>
  
  <p>Any ideas how to fix this?</p>