Just a clarification, probably a non needed clarification but just in case. The prev/next/first/last buttons or links should move to the full image (prev,next,first,last) of the gallery where the memeber is currently "standing" meaning if you came to the image from the what's new gallery, then the next link will send you to the next image of that gallery if instead yo come from an artist gallery then should send you to the next image of the artist gallery and so on, keeping in mind filters etc. this might complicate things a little bit (at programing level) but it sounds to me as the logical way to make it work if it's made at all.