A tip that might help, especially on dialup: When I'm browsing a gallery, any image I want to see in full I open to a new page. I can view the image, make a comment, vote on it, or just keep it open to look back at a second time, whatever. When I'm ready to move on, I still have the gallery of thumbnails handy, still in the same place where I left off - and it doesn't need to reload.