HTML help for new site?

[draconis]

I've seen web pages with photos set up a particular way, and I'd like to do something similar.

What I'm trying to duplicate is the sites where you have a row of thumbnail-sized photos, and if you click on one of them, a full-sized version appears in a designated spot on the same page. Click another thumbnail, and the previous full-sized image is replaced with the new one.

Can anyone point me at information on how to do this?

Thanks!