ADD TO CART not functioning in SAFARI

I am using Gold Cart plugin w/ WP e-Commerce.

Clicking the ADD TO CART button does not add product to cart in SAFARI. It stalls with spinning wheel and “Updating Cart” message.

The problem is only in SAFARI, works fine in FIREFOX.

http://coronadocookies.com/products-page/

I have turned off plugins, which did not solve problem.

Thanks for prompt solution

http://wordpress.org/plugins/wp-e-commerce/