Image gallery within a post (AJAX, prev/next navigation)

There are probably dozens of ways to explain it, but I’d rather show you a perfect example:
http://www.televisionwithoutpity.com/show/holidays/holiday_guide_2008_whos_naught.php

It is a simple and neat-looking gallery where you can read text description below every picture and click previous/next to navigate to the next one. I’d love to have a similar one for my WP blog, but I couldn’t find anything. I’ve been told that there is a plugin for Next-GEN, but still I had no luck findning it.

The main thing – I don’t want it to be a pop-up, I want the image(s) to be shown within WP post/page like it is in the example.

Can anyone please help me?