GK3 isn't working

when you click on the pop up window the nothing happens the site refreshes but than nothing happens it stays on the mane page

and also on gk3 when u click add to cart it also wont let it add to cart.

can someone help me please .

www.calaverosache.com

i think this is the same issue as this:

http://www.gavick.com/forum/90-mystore/ ... oduct.html