That isn't a JS error, though I don't know what it is. I see the following 2 JS errors:
[cycle] terminating; zero elements found by selector jquery.cycle.all.min.js:1
FB.getLoginStatus() called before calling FB.init(). connect.facebook.net/en_US/all.js:52
so I would consider disabling some plugins to see if you can isolate further.
As usual in these cases, I recommend you disable all plugins and then re-enable them one at a time. Also, You might need to remove everything you've customized in your functions.php and then add it back slowly too. Sorry, I cannot be more specific without digging into your code for you.
PS- it is really hard to look at your site when I've given up sugar for a few weeks!