75753 login script

I need someone to create a script where people can log-in to a certain part of our web site if they enter their own user name and password. I have a list of all the user names and passwords, but I need you to help me make it into a database and then make a log in form for the site that will work with the database. I also need to be shown how to access the database and add and delete users. This is a fairly simple project to the experienced programmer.