The next time you purchase a product online, how sure can you be that you’re buying the real thing?

Counterfeiters are now duping consumers with websites designed to mirror real company sites. Besides fake luxury handbags or watches, people can even buy fake viagra or fake software from these websites.

In some cases, the phony websites with more pictures and products for sale even look more elaborate than the actual website.

Lev Kubiak, head of the Intellectual Property Rights Center, told ABC News’ “20/20″ that the best way to tell a website is real is to “look at the manufacturer’s website. Take a look at where these companies say their products are distributed.”

Below are images of real websites next to their copycat counterfeit websites. Can you tell which is the counterfeit website?