images at the bottom of the navigational bar

Hi everybody,

my name is Roberto Gianassi and it's the first time I write on this 
mailing list. I've searched on google and the archives, but I didn't 
find anything useful.

What I would like to do is something similar to:

http://docbook.sourceforge.net/

On the bottom of the green navigational bar there are present two little 
gifs:
created with DocBook and created with Libxslt.

How may I do that? Is it possible to put those images immediatly below 
the links of the navigational bar (for visibility purposes)?

I apologize if this is an already made and/or stupid question, but I'm 
new to both docbook website and XSLT...

Best regards,

-- 
Eng. Roberto Gianassi
http://www.roberto.gianassi.name