Having problem with keyboard/computer

Suddenly, my keyboard is behaving very strangely. Sometimes, like now, it seems to work fine, then instead of, say, lol, it will type 363. When the keys don't work, neither does the delete button. I usually use Safari, but tried Foxfire. The keyboard did not work there either. Presumably it must be something in the computer itself then.
Has anyone ever had this happen? If so, what can I do to fix it? Why is it acting this way? I have already tried emptying cache, deleting temp files and repairing disk permissions. None of that seemed to make a difference. I'm not sure why it's working so well right now, but thankfully it is.
Any help would be appreciated.
Thanks,
Kate
ibook G4   Mac OS X (10.4.9)  

I did that Doug, and it's working fine. That must have been what happened. Thanks so much for your help. It's so nice to know you all are here, just in case I have a problem.
I will mark this question answered, and thanks again.
Kate

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