Simple Login for a website

Hey guys, quick question:

I have a site that needs to prompt the viewer for a login and password when they arrive, and I am looking for the most economical way to do this. There are 300 employees who will be given the information - the point is just to keep the casual passerby "out".

This is not a high security situation, but the pages of the site (probably only 5 to 8 total) need to be unaccessible without the login information.

Can anyone suggest a starting point or method here?
I posted here because this is more of a general question that I figured could be solved using PHP...

Thanks much for your help.

The simplest and easiest way to password protect a webpage is with HTTP Authentication.

http://php.net/manual/en/features.http-auth.php

Ah, very cool - I will check this out right away, thanks. I am setting up the admin with Contribute which is pretty straightforward - if the admin just "pulls" pages down and edits them do you think this will cause any issues?

I'm just wondering.
Thanks again!