looping on NEW and OLD in a trigger

Hi,

I'm very new to writing postgres procedures, and I'm trying to loop over
the fields in the NEW and OLD variables available in an after trigger,
and I can't quite get the syntax correct.

Could someone point me at an example?

Thanks,
Mike
--
Michael P. Soulier <michael_soulier@mitel.com>, 613-592-2122 x2522
"Any intelligent fool can make things bigger and more complex... It takes a
touch of genius - and a lot of courage to move in the opposite direction."
--Albert Einstein