Gallery within a post

Hi,

Actually I want to use the same technique whish uses this blog for displaying images in a post. Clicking on a thumbnails displays a large image above. I know it uses a JavaScript and it’s possible grabbing the code and use it but I’m trying to ask if there was any image/gallery plugin which does the same job?

If not, can anyone write such plugin?

If you didn’t understand my request properly, ask me and I’ll try to explain it in details.