Well, unfortunately its hard to tell what method he used to get in, that looks like either a template hack via the db or a file hack, typically global.php seeing as its every page.
If its a tempalte hack, do a search on the DB via phpmyadmin with keywords from the page source of the hacked page.
Logging into your admincp will most likely not work anyways.
I would suggest you globally disable your hacks in config.php, which is most likely the way he got in anyways.
Upload the default vb files and upgrade the site to the latest version of vb.
THERE IS NO NEED TO RESTORE FROM A BACKUP, THIS IS A EASY TO FIX.
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