onclick retrieve data from table

hey !! i m working on a e-mail project. i m stuck at one place.

in it's inbox it shows messages that r fetched form mysql database.. it only shows id, subject , date , and message upto 10 char.
 what i wanna do is show that full message on onclicking that table row.. below in a div..
if it can be done without reloading page then it would be perfect..
i tried with xml but problem is it is unable to send that row id to that page where xml loads...
plz help me out with an easy solution !!