How to start Session in Jquery and then use it in php.?

How to start Session in Jquery and then use it in php.?

Hi firends,
I want to create a session in jquery and then want to use that in php.

  var sl = $('input:text[name^="Slno_"]', row).val();
using this  $.session("in_tra", in_tra); <--not working-->
session.setAttribute("example","mysession");<--not working-->

Pls Guide me how to do this?

Thanks