Add top information to all webpages (like godaddy AD)

[Jorge Bastos <mysql.jorge@xxxxxxxxxx>]

Howdy,

I'd like to do something that I don't know if that's possible somehow.
I have squid configured as transparent, and I'd like to add on 
everypage that the user visits, information on the top of the pages, 
like an AD.

Is this possible?
For example Godaddy has this on the free hosting they provide.

Thanks in advanced,
Jorge Bastos,