I have definitely seen this image slider gallery [most likely a Wordpress plugin] somewhere, which is similar to this Featured Content Gallery but with thumbnails on it. The thumbnails are hidden by default & mouse overing the bigger image reveals them, which you can click to proceed to the next image. I spent more than 1 hour looking for it, guess i suck in Googling If you can find a link to that image gallery plugin you will be in the good eyes of the holy church [or whatever god you worship]
i have a 7.3gb template and script collection. reply if u want the links to my reseller pack on my servers...u normally have to pay 60 bucks or something, but it says free resale rights, and i kno it has image thumbnail scripts.