Custom login script

[militaru]

Hi,
I am new to vbulletin and i have a question. I want to implement a login script so that when users login to my site, they will be also logged in to the forum.
I search this forum for a solution but i couldn't find one that i can use.

This is the way i came up with:
- when the user logs in the site, i put the username and hashed password in a cookie.
- when he enters the forum, in global.php i check if the user is already logged in the forum.
- if the user is not logged in, i want to log him in with the username and password in the cooke.

Or maybe a can give the user the same login cookie as vbulletin would, and insert a sessionid in the db.

My problem is how can i use vb's login function, process_new_login();

Thanks a lot.