Tesco, the British retailer, developed a nice solution to show users product pictures avoiding the use of pop-up windows.
Pop-up windows are a big usability issue, they confuse users and they negatively affects impaired people. Think that some people just don’t notice the pop-up windows, some close them straight away and some don’t know how to close them.
Tesco placed a “View more images” link on the product description, when clicked, the user is taken to the pictures page.
Then, in the pictures page they placed a very visible “Back to product” link. I think this solution is a very good one and help users easily navigate pictures. This is a nice usability pattern to keep in mind.