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Isn't this a problem for people whose keyboard's don't have a numeric keyboard (like my colleague's)?
Numlock would only be available if the user has a numeric keypad on their keyboard.
If they do not...? (and that is really the point of this question)...if they do not, how do they get access to keyboard navigation? And, really, why wouldn't the '+' and '-' keys in the main keyboard work by default anyway?
Having said all that, I'm not really that concerned about it. It's a good post to have kicking around, though, just in case anyone else thinks, as we did, that there was a problem with the JSAPI.
Cheers,
jtm