[jQuery] update a div within a submit

[jQuery] update a div within a submit

hi to all.
sorry for the dumb question, I'm a total noobie of jquery.
I just want to ask what's the equivalent code of updating a div with
the results of a form action when hitting a submit button of jquery
instead of scriptaculous and prototype.
I've read jquery docs but I found them a little confusing.
thanks in advance.
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