Jquery :: Session Value Not Getting In An Another Page?

In my project i am using ajax and jquery. After going to a page via ajax without page reload i want to see the same page if the user refresh the browser. I used the cookie plugin inorder to solve. As it is not safe i am trying to do the same using session. I have dowloaded the jquery session plugin and initialized the session variable using the below satements.

var SESSION_URL = $.session("current_url",Url);
var SESSION_DATASTRING = $.session("dataString",dataString);

and i am getting the session value in the same jquery $(function) where it is initialised, through alert($.session("current_url");

But i am not getting this session value in an another jquery event like

window.load(function(){
});

How can i get the initialized session value in an another event.