Remove the SALT check from the password hash

[DrKNickel]

Hello everyone,

i have a really big user database from a selfcoded cms. We would like to integrate Vbulletin and import the users from the cms database to the vbulletin database.

The cms database uses md5 hash to store the passwords.

Vbulletin as far as i understand uses md5 plus the salt method.
$password_hash = md5(md5($password_text) . $user_salt);

A simple import does not work. Is it possible to remove the salt check? Or do you have another idea for a solution for my problem?

Thank you very much for your help,

greets drknickel