Is it possible?

Is it possible?

Sorry Im kinda new to jQuery, Im currently using the tablesorte pluggin, Im makin a website with a table that has some customers information, the thing is that the header has actually 3 rows as the 2 first are filled with information, the third row its the "main head" so to speak...
I want to use this 3rd row to sort the table.. I tried to tag the 3rd under thead
but it wont work it always take the first row which its not functional as some of the have more columns that the 3rd one..
any hint or any tuto that could you advise?

thanks in advance...