added Lightbox icon, it's the Favicon of the Lightbox info page. It is *not*...

added Lightbox icon, it's the Favicon of the Lightbox info page. It is *not* the same favicon as the main page hosting the lightbox page has; it's a green version of it, so I think that it can be seen as the "Lightbox logo". It is also so simple that it can't be copyrighted. :-)