JS Verify Script for Form Contents

I'm trying to find the javascript that can be used to verify form input data when the form is submitted. I want to use this on a join page where the username/password is selected.

I've seen them that require a specific number of characters, and then makes sure the password is not the same as the username.

I just can't find it anymore!

http://www.webdevelopersjournal.com/...date_form.html

Check out this page for links to form validation using javascript.

I think php would be easier but go for your life.

Cheers,

Allan