Dual login system

[jackti]

Hi guys.

I've just started upgrading my site and i've decided to go from a Phorum installation to vB

I had a lot of posts in my old forum, but the problem is not converting the posts.. It's that in my "old site" there was no forum verification system, there was only one custom system to hold all the users. (which, btw. had all passwords in clear text.)
I want users to register and log in on my own system, should i make a system that will copy the registration details to both databases and code the site accordingly? or try to merge the databases together (that seems very tricky because in the old system, users are unique by their emails, not by a name)

Can you guys give me some feedback on the best way to handle this? What cookies would need to be set and what would be the best way to achieve this.

I've been thinking, if i just copy the vBulletin registration form (hidden fields and such) onto my own registration page and redirect it somehow it should create two user tables right? also, as a logon procedure, setting the vB cookies shouldn't be a big deal, or is it?

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Jack