Image Popup Script?

I remember seeing and hearing about a script where you can click the images and the background turns darker and shows the image only, then from there you can click the image to close it and return back to the site.

Does anyone know what script i'm talking about? If so, please give me the name or post a download link.

Any help appreciated.

Lightbox

http://www.huddletogether.com/projects/lightbox2/

Thanks a lot man.