button with vertical label

[franco spinella <spinella franco tiscalinet it>]

Hi to all,
I'm sorry if i'm submitting this request again, but the first one was no
readable....

Does someone knows how to create a button with a vertical label, instead of
a
normal horizontal one ? I'd like to define something like a bookshelf, where
each button is a book you can click on, and the label should be the book's
title.
Thanks in advance

Franco