log-in to non-vb pages using vb passwords?

[arossphoto]

Before I purchased vBulletin I asked a question in the pre-sales forum about creating a login page for a php/mysql directory I created using the vbulletin username and passwords. I was told at that time that it would be pretty easy to do. I want to get started on this now, but I haven't been able to find any more info about doing this.

What I have is a member directory for photographers that is searchable by speciality, location, name, etc. I currently have to maintain all the listings myself, so I would really like members to be able to update their own listings and log-in using their vBulletin username and password.

Any advice would be much appreciated.

Thanks,

Andrew