Circle strafes. How to ? ( + demo on failing

Hello guys.
I want to learn how to circle strafe, because I find it easier than normal strafes. This guy here has some awesome strafes

http://vbox7.com/play:fb00caf79d

Here's a demo of me doing them, it sucks hard, but I just can't figure out WHY I do them wrong.

Demo : http://www.4shared.com/file/oAq9cBcy/GGN18.html?refurl=d1url