I have IFrame load one of the menu item click in that page left side I have tree structure and top of the page menu Items.Center of the page loading with IFrame.Whenever session going to expire I am giving alert(session will expire soon). But this alert is coming for Iframe window (after some seconds complete) as well as parent page.That means two alerts are coming whenever session going to expire .That alert should come on parent page not in Iframe page.How to avoid this?