Since you were so great in helping me with some PHP stuff last time, I thought I might ask here again.

I'm looking for a simple image gallery script that allows me to browse through an image collection. Now there are probably millions of gallery script out there, and most of them are probably way too complicated for what I'm planning to do, so maybe it's just a few simple code lines for you.
What I have is an HTML page with a table that contains all image thumbnails, about 80 pics in total, named "t_picture01.jpg", "t_picture02.jpg" etc., located in a "thumbnails" subfolder. The images themselves are named "picture01.jpg", "picture02.jpg" and are located in a "photos" subfolder. Now, if you click on a thumbnail, a popup window should open and display that image. So far, so good, this is easy with HTML and some Javascript.
Now what I would like to have is a feature that allows the user to browse through the images in this popup window with "previous" and "next" links. Ideally, the script should read the current filename (or number suffix), and change the links accordingly. I. e. if someone opens the image "picture18.jpg" in that popup window, the "previous" and "next" links should link to "picture17.jpg" and "picture19.jpg".
As a "deluxe" version, it would be cool to display an image description as well, but it's not really mandatory. Of course I could do the whole stuff manually as well, by simply creating small HTML files that contain the images and matching links, but I don't really want to create some 80 HTML files for that.

Any suggestions?