Website question

While working on my website I tried to figure out how to organize the images in the simplest way. What I wanted to do was have one html page, for the projects, that would cycle through the images when you clicked the 'next' or 'previous' buttons. In other words, the only content that would changing would be the image and not the entire html page. I couldn't figure out how to do that so in the end I made one html page for each image. I didn't even think that what I wanted to do was possible but I lo have seen it in action. Nina Berman does it on her site. I think it is done with javascript but I don't know any more than that. Help please.