Password secured webpage for a Wikipedia page

[sesproul]

Hello,

I have a website that has a Wikipedia installed in the www.websiteroot.com/wiki directory. I want to have this page accessible only for authorized users.

Once the page is accessed, the Wikipedia will operate as normal, but I need to lock out people from the page that are not on an approved list. How would this be handled? I have seen where websites have login to the site once a user authenticates in the website. (Like this site does with the login), but I have no idea how to do this like I show in this picture.

http://www.StephenSproul.co.cc/LoginFromServer.JPG

If there is a tutorial on this I will take the time to read it, I just need to know what this is called, so that I can start researching the problem.

This is a GoDaddy LAMP hosted site.

Thanks.

Steve