I'd been looking for a tool just like this and after digging around for a bit I decided to go with Art Sexy Lightbox. So glad I did. Fantastic tool, with tons of versatility and implementation methods.
Initially I had some troubles getting it up and running. The issues had nothing to do with the extension I came to realize, but were small setup tweaks that needed to be done within Joomla!.
When I ran into trouble I contacted dev and within hours they contacted me back (and over a holiday weekend mind you!). By noon the next day the issue had been resolved. They even offered to go into my system and have a look. How cool is that?
Love the tool, and love the customer service. Great work all around! Thank you--and keep it up!!!