The best way to do this would be to add a plugin that hooks (via a post-hook) into auth_valid_session. Basically, it would look for the username and password cookie, and if found try to validate and set a cookie (Hint: most of the code you need to set the cookie properly is in GForum/Authenticate, sub auth_valid_session).

That way, when someone logs in, if they have cookies enabled, they will get a new GForum cookie - but it will happen automatically behind the scenes.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com