One handler to consider adding to your AJAX requests is on0.  This is  
called if the connection to the webserver fails, typically because the  
the server is overloaded or has gone down since the page was loaded.  
While these conditions are uncommon, otherwise a failed connection  
calls the onSuccess handler!   And if your webserver is overloaded or  
down, it's good to tell your users to wait a bit before trying again.

I've updated the example at

Doug Reeder

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