How to Collapse reply comments

I use a code in this post

http://ww.wp.xz.cn/support/topic/collapse-comments-not-working?replies=20

and it can collapse my comment all .. but actually i want it to collapse only reply comment.

i want it to show all of comment and reply when open page
but when click some link such as ‘toggle’ or ‘view replies’ on bottom of comment , it will expand to show the reply of the comment.

thank you for your helping and sorry for my poor english language.
PS.I use theme “twentyeleven”

http://ww.wp.xz.cn/extend/plugins/jquery-collapse-o-matic/