I suggest looking at these two references to get the hang of events:
http://www.quirksmode.org/js/introevents.html
http://www.quirksmode.org/js/events_compinfo.html
You're going to test by key ranges basically. After the keypress event,
you'll test event.keyCode against the different key codes. If it matches a
restricted key code (or doesn't match an allowed one, depending on how you
approach it), you'll send an event.preventDefault;
It should look something like this (warning: pseudo-code):
connect('elem','keypress',function(evt){ if (evt.keyCode < 43 or
evt.keyCode> 98)
evt.preventDefault(); });
I'd also suggest poking around here if you have any issues:
http://developer.mozilla.org/en/docs/DOM:element
As for each key's codes, I'll leave that to you and google. ;p
Hope this helps :)
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