Anyone know of a mercurial front end written in JavaScript?

[Eric Arseneau]

I found a really cool wiki that uses mercurial as its back end, http://hatta-wiki.org 
.  But it made me thing, why not do something like http://tiddlywiki.com/ 
  which is all "local" implementation of the wiki engine, no server  
side, and use mercurial as the back end saving mechanism.  Yes I could  
use tiddlywiki and commit the file, but it seems like it could be  
useful and more self contained if done using mercurial as the storage.

Therefore the question, if I could find a mercurial library it would  
make the work a lot easier.

Thank you,