[Thinkpad] strange tab behavior?

my 570 in internet explorer has suddenly started skipping between
_progams_, rather than fields on a page, when i hit the tab key.

why does this happen and what can i do about it? i have rebooted the
machine.

thanks.

-- 
Donald                           
Donald M. MacQueen [|]
"All that is necessary for the triumph of evil is that good men do nothing."
- Edmund Burke
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