Rails spinoffs - Oct 2005 - Prototype and request timeout

It seems like I''ve seen mention of this being in development.
I''m
looking for the ability to raise a onTimeout "event" when a specificed
amount of time elapses between the dispatch of the request and the 
arrival of the response. A timeout would be another kind of failure and 
fire onFailure as usual. I have some code I''ve written to patch this
but
its ugly and it''d be nice to get rid of it. Anyone know if such a thing
is in the pipeline or implemented somewhere?

thanks
Sam
-i-am