Um...click the "Leave a comment" link at the bottom and you get a comment box with the name defaulting to "Guest". Doesn't get much easier than that.
The script tag loads content from this url: http://js-kit.com/comments-data.js?jx=0&gen=0&srt=da...;
So either no-script is blocking that or you have security settings that don't allow script tags to an alternate domain or something of the sort.