Adding Users to VB via Seperate Signup Form

[dreamache]

I want to be able to take just the username / password / email fields that i require on my sites custom signup form, and when I post, i want to automatically add them as a user to the vbulletin database - and when they submit it, i don't want them to be directed to any vbulletin page, I want them to stay on my own page.

then, once the code adds them as a new user to vbulletin, i want it to automatically set the cookies that will have them logged in when they visit the forum - that way they won't have to login again. plus, when they login through my own custom login form, i want them to of course be logged into vbulletin.

anything out there that will handle both or either of these requests?