I have a PeriodicalUpdater that refreshes the contents of a div.  If
the user's internet connection (or the remote server) goes down, I'd
like to change its contents to some message alerting them to the
problem.

My first thought was that this would be covered by the onFailure
handler.  But that's not universally the case.  In Firefox, Webkit and
Opera, the onSuccess handler is called with a status of zero.  In IE7,
the onFailure handler is called with a status of <insert large and
gradually incrementing number here>.  What's the right way to do this?

Then, once I've caught the failure, is there a way to get a reference
to the PeriodicalUpdater's div from within a handler, so I can update
it with my message?  I know Prototype provides a way to direct failure
output to a different div.  But in this case there is no failure
output; I'm providing my own message.  I can think of a couple of ways
to hack around this using a curried function or a global variable, but
I'm wondering if there's a cleaner solution.

Thanks!
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