[jQuery] Update DIV

Hello Everyone,
I am looking to see if I should switch to jQuery but first need to
find jQuery's equivalent to Prototype JS's Ajax.Updater; new
Ajax.Updater("id", url, {method: 'post', parameters: pars});
Ajax.Updater allows you to simply update the content of a DIV.
ps.
I did find his plugin called Tabs, http://stilbuero.de/jquery/tabs_3
but was looking to learn how to do it without a plugin.