Comments script with pagination

After seeing various scripts for comments, and that in time can be added so many comments that make the page loads slower, I thought to make a comments script that paginate the comments, without affecting the URL of the page.
So, I made this [b][u]Comments script with pagination[/u][/b] with Ajax, it can be included in both HTML, and PHP files (but the server must run PHP).
If you want, review this script, and post your opinion.

Many other spam controlling tools are there, the good thing here is made is AJAX. I think it would be better if some filtration(instead of simple moderation to all) is there and other functionality like easy deletion.