Thanks a lot Jeremy.
I am not sure that's what I need. I think I didn't express my self correctly. What I like of the Tiled gallery (respect the Thumbnail's one) is that when you move the mouse over the images it appears the related name. That's what I'd like to add to the Thumbnail gallery in some way. I would like to find a way to do this through CSS. If you go on this page you'll see how I have modified the CSS to make the name appear in white over a dark rectangle. It would be great if I find the way to make that happen on a Thumbnail Grid.
Really, thanks a lot for the time you are dedicating to me.