[Michael Morris]

If you are on Linux go to the Joomla root and run these commands as the user with write permissions to the directory.

ln -s /path/to/your/forums/clientscript clientscript
ln -s /path/to/your/forums/cpstyles cpstyles

Copy all the Joomla images to the vbulletin /images folder then delete the Joomla images folder and run

ln -s /path/to/your/forums/images images

Finally rename the htacces.txt file that came with Joomla to .htaccess
Among other things, this will allow the Apache client to follow the "symlinks" created above.