Lightbox Effect / Javascript etc

We have a linked image going to a full size photo page, e.g.:
<a href=fullphoto.php?id=55><img src=thumbs/th55.jpg></a>

We need that link to stay as it is, for search engines and so non js users can see the full picture. However, if user has js enabled, it should show the full photo in a lightbox effect on the current page.

We can include the full image location as a rel=... or something like that.

We currently use jQuery on the rest of the site, so ideally the only JS framework it should use is jquery (no Prototype, etc)

Also we have flash on this page. The lightbox effect should work with flash (i.e. it should not show the flash on top of all other layers)