Bypassing Browser popup blocking when automatic session timeout occurs

Please help regarding the following issue.

I have enabled the "Block popup" option in browser. We are doing a session validation using a background ajax call to check the session is active or not. If the session is not active for a desired interval a popup window will come for notification.

Now comming to the problem . since the session notification popup is comming automatically without any client interaction, This popup is blocked by the browser. But if a client clicks anyother popup window in the form that popup window will not be blocked by the browser.

I want the session notification popup window also not to be blocked by the browser even if the browser "Block popup" option is enabled.

A popup blocker is used to block popups. If there was a way around it, it would be completely useless.

You can either:

1. Add an exception for your domain in your popup blocker's settings
2. Not use a popup for your notification but rather display it on the page itself through javascript