Need help modifying login coder javascript

[teachersnetwork]

Hello,
I'm quite new to javascript. Although I have successfully used and modified scripts from the web before but I have no idea how to modify the one found at:
http://javascript.internet.com/passwords/login-coder.html
I really like this script except that I would like to be able to add users to the list as our user base grows without having to go to the page where I found the script, add the user, update the script, and copy the new information into my existing page. The "scriptmaker" appears to be encrypting both the passwords and the destination pagenames. I actually don't care about encryption (we're just trying to create a barrier, not anything really secure...). Can this script be modified to turn off the encryption so I can just add straighforward usernames, passwords and destination pages? If anyone has any other suggestions, I would appreciate those also. If anyone knows of another script that would allow for multiple user logins using multiple passwords, I would appreciate that information also.
I did try to contact the author of the script but his/her page no longer exists.
Thank you in advance for your help.

[DaveSW]

There are a number of other scripts there that would do:

http://javascript.internet.com/passwords/multiple-users.html

http://javascript.internet.com/passwords/multiple-users-prompt.html

Bearing in mind ofcourse that these are very insecure.
Or are you looking for something else?

[teachersnetwork]

It looks like either of your suggestions will work for us! Thank you!