I haven't heard of JS-Kit before.
I just did a quick search for it and found http://lifehacker.com/software.....218219.php
Based on that it sounds like a bad idea for a business web site for the following reasons:
1. The comments are stored on http://js-kit.com/ so if that site goes down so do your comments.
It does the have the advantage though of being easy to implement.
If the above two reasons don't look like a problem for your site you can just add the code on that page and be done.
Otherwise if those would be problems, post what server side language you use (ASP, PHP, Ruby, etc.) and I can see if I can find a comment system that would work.
Note though as far server site languages go I only a little bit of PHP so I can't help much for other languages.