Need help w/javascript error using Cart66

I’m using Cart66 with the Compra theme from Mint Themes. When I enable inventory tracking, I get “Inventory tracking will not work because your site has javascript errors.” I’m guessing that the theme has the errors, but I don’t know javascript very much, so I don’t know how to find or fix the problem. The client is really on me to fix this, so any help would be greatly appreciated. The site is at http://www.carolinabowties.com. The error shows up on the product page when I have inventory tracking turned on, but I’m guessing the js errors are there all the time? Can anyone help me with this?