session expire and jqery ajax call

[eluser]Hallas[/eluser]
Hi all,

I'm trying to figure out how to create a helper function, wich will be loaded in controller, and detect session expire for jquery ajax calls and redirect user to login page.

I try google search and found this : http://www.zadrosolutions.com/blog/ajax/...-with-php/

but it's still unclear to me how to make it work.


Can anyone help please ?