embedding website/pages into a website

I a website with a code that will allow you to embed shop onto my website. But there is an issue. It works great but when you click on a product on a product on that page, the url does not change in order to recognize the product identity. Go to my website to see what I'm talking about. www.marcellaessentialsboutique.com and click on cafepress accessories from the navigate but on your left and then click on a product and see does the url changes with it to identity products. Thanks.