Integrating vBulletin with a comunnity

[StateCollapse]

My colleague and I work on a contact page and want to integrate the Vbulletin-forum with the login on the homepage. When you access the home page so you should also be seen in the forum without having to copy the code for login. We have already tested PhpBB, PunBB and Vanilla. It has been a pure nightmare to try to integrate these forums to start login. Now we thought to make one final attempt to integrate vbulletin with homepage.

Is there anyone who has previously integrated vbulletin with a site that can help us to solve this?

Before you answer, think about this:
Though it might not be as smooth directly, to copy the login-code. For example, if you're upgrading the forum. The problem is of course a bit that we then develop the forum to have more features instead of having its own code and then just use the forum as a resource. Example, if you upgrade to a newer version of the forum you have to do on their own code every time or copy the code again. The site is locked by the forum a bit if you understand.

Are there any other approaches?

You can read themselves here so you understand what I'm looking for:
http://www.vbulletin.com/forum/showt...33#post1929833

Regards
Kim from Sweden