Is there a WordPress plugin to collapse/expand categories?

I've got several categories, including one parent that has several child categories. By default, they all show up, but I'd like to be able to show the children only when the parent category is expanded, and then be able to collapse the kids back down again.

I've been looking long and hard for this, and as a newbie, all the stuff on wordpress.org seems like it was written by programmers for programmers.

Does anyone know of a plugin that will do this for me? I'm not adverse to manually editing a few files along the way.

Any ideas? Thanks in advance.

~ Kat

 

U mean to say this type ?

http://www.seofirm.info/
When we click on a category, then the sub categories open.

 

Yes, that would do it. Where do I find the plugin for it?

Thank you!
Kat

 

Here is the link for the plugin :

http://www.silpstream.com/blog/wp-dtree/

Hope it helps.
But it has decreased the time of loading of the page a bit after the plugin is placed.