Can anyone help me in my problem?
Example:
I have 2 same page have same session the first page is idle and the another not idle but when 30mins done the first page popup to timeout a session but I'm using second page that's why no idle in 1st page because they have same session
This sounds mostly like what Wordpress does with the "heartbeat" api.
You could check out how they're doing it:
http://phpxref.ftwr.co.uk/wordpress/nav.html?wp-includes/js/heartbeat.js.source.html