Rather than 'loading', 'nextLink', 'overlay', etc all the class names and ids should be prefixed with 'lightbox' or 'lb' or similar so won't conflict with anything else using the same names.

The index.html mentions the references to closelabel.gif and loading.gif as being near the top. They're near the bottom :). It'd be helpful to have those pulled out and moved to the top for easy reference/modification as needed. Thanks!

This is because enableKeyboardNav() is only called when more than one image (called from updateNav())

I am only using IE tester software so the issue may lie there, but the black overlay only covers the top half of the webpage. When a page is scrolled down the overlay is missing.

I know IE6 is old and broken but I still need to cater for it.