-Based on SEB's auto resizing enhancement (http://seb.box.re/2006/11/22/lightbox-2-auto-resizing-enhancement)
-Added a "show full size" link
-The resized image is now generated on-the-fly server-side. No more ugly browser resizing.
-All resized images are cached in /var/tmp/thumbs (configurable in lightbox2/thumbs.php, set $cache accordingly)
