Centering the header banner

[Veneti]

Does anyone know where to go in the files to insert the banner code and make it center?

I know the initial vbulletin icon calls up from images/misc/vbulletin3_logo_white.gif

And the second question, is there logical templates for insertion of adsense into 3.7 or do I need to go into that adsense deep tutorial and start playing around with template code?

Thanks in advance to anyone that replies, appreciated.

(Note to vbulletin, you should have a basic implementation framework that board users can follow, its obvious that high numbers of board owners want to put header banners in, and its obvious that most will want to monitize their boards so they pay for themselves, why not have a user friendly manual).