Can't post with JQuery

[eluser]pickupman[/eluser]
In Firebug, click on the Console tab. This is probably where you are seeing your log messages already. When the blur or keyup is fired, you should see in your console some like
+POST '/yoururl/controller/method/' 200 OK

If you click on the + beside POST you should be able to see what variables where posted, and what was returned by the server under the Response tab.

Your code looks correct.

Try placing an alert before your $.post to see if the event is being fired. Silly to ask, but are you linking to the proper jQuery source?