Thumbnail

Hello
I would like to say that gallery is the best ever.
I want to know how i can make (or if is possible) to have thumbnails of gallery, when viewing the fullsize picture.

I mean:
i have 3 galleries.
I click one, then i see 10 photos.
I click one photo, then, at that page in left, or somewhere to have all the other 10 photos, but smaller as a thumbnails.

Escuze my english, all i am trying to say is when I see one photo from gallery X, the other photos from X gallery to be thumbs in left (or right, or ..anywhere, but i preffered in left place)

Can some one tell me?
Thanx in advance