Unable to capture the Idle time for BSP page

Hi Experts,

I want to capture the Idle time of my BSP page. If that is 5 mins then i have to display the pop up displaying the remaining time.

Please let me know how to capture the IDLE TIME. not the time after the page is loaded.

Any suggestion will be helpful.

Aready checked in SDN but unable to get the solution so posting it.

Thanks in advance.

Sravanthi.V