Get Session Value From a Modal Form

Hello at all!

First I want to thank you for the great work!

In my datatable I want to decide to reload the page in relation to a PHP-Session, generatet on a modal Form.

                 "fnDrawCallback": function(oSettings, json) {
                    $("a[rel^='prettyPhoto']").prettyPhoto({
                        modal: true,
                        show_title: false,
                        autoplay: false,
                        callback: function() {
							 ?>
						}
                    });   
                 },

In the callback function I want to check the SessionValue to decide, if the form have to reload (f.e. when the databaseentries are updated) or not.

I don´t know how i can get access to the Session Value.

Thanks for reading and ideas!

Frank