well i dont know the shoutbox, but i assume its calling also php files..
so i think what you basically should do (I may be wrong...)
1. go through ALL the shoutbox templates and make the urls absolute ( that should work as you basically dont do anything else than a base href but for shoutbox only)
2. for all the urls generated by the php files ( I dont know if there are any), do the same. (add the
http://www.yoursite.com/forum... in front)
3. test it.. if it works replace the
http://www.yoursite.com/forum with the vbulletin variable:
$vboptions[bburl] in the templates and
$vbulletin->options['bburl'] in the php files.. so if you migrate to another server.. you shouldn't have problems..
but as I said.. i dunno if it works.. because i never used any shoutbox.
Luc