Hi How to integrate comments with reply in blogs??

Right now I am using Comment view for comments on blogs, and my client requirement is that if any user can post a comment on a blog then another user can also post a comment as a reply on this comment.

I check this on various sites which are developed in kentico and its working on these sites e.g.
http://showcase.gspnet.com/Dialogue/GSP-Dialogue/October-2011/What-s-Driving-Change-in-Workplace-Design
http://www.parentingideas.com.au/Blog/December-2011/Congratulations!-The-wait-is-worth-it!
I want the same functionality like these sites...