[Orgmode] Feature request: javascript expand collapse

[Xin Shi]

Hello  Experts,

I'm wondering if it's easy to implement the "_javascript_ expand collapse" in the published page. 

For example: in this page:

http://en.wikipedia.org/wiki/Emacs

One can click the [hide]  or [show] beside the Contents.


Probably in the org file, we can use:

**** A Detailed section  [+]

to indicate this collapse?

[This might be  work for Sebastian again :-), but I think this feature shall be useful. ]

Thanks!

Xin