Javascript/Ajax error help in Internet Explorer

I'm building an e-commerce site for a client, and for some reason in Internet Explorer when I click the add to cart button, the shopping cart messes up the quantities added into the cart. I think for some reason IE is refreshing the page, causing the quantities to double, I just can't figure out how to fix it. I would greatly appreciate any suggestions!

An example of what I'm talking about can be found here:

http://tcatvs.com/?p=361

Then add one of the products to cart and click the 开发者_如何学运维mycart image at the top right and you'll see what I'm talking about.

Thanks guys!

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You have a syntactic error in wp-e-commerce.js, on line 240:

var container_offset = {'500'};