Redirecting to custom page after accessing private threads

[bradleyullery]

Hello,

We currently show private forums in the main view, but block access for those without the proper credentials. However, we need to distinguish users who are logged in without proper permissions and users who aren't logged in at all. Each case will have a custom page they are redirected to.

This vBulletin stuff fell into my lap, and I know very little about the whole structure. Any ideas where I can put in a php permissions check and redirect?

Thanks!