Floating shopping cart and regular shopping cart not working

Hi,

I have a Multisite with Marketpress on a subsite using Nathan Onn's Pro theme. The floating shopping cart isn't working - neither is the regular shopping cart. He's looked at the issue and told me to contact you all because he's not sure what's going on and he said it's not the theme that's causing the problem. Rather than the Shopping Cart, we get a blank white strip and the amount always remains at $0.00 in the cart and in the floating cart. It says there are no items in the shopping cart. Help, please.

You can see the problem at https://www.mobility-organics.com. Look under either Hair, Face, or Body.

Thanks,

Sherry