>Hi Len,
>
>I have read those webpage slightly, it seems like the browser only refresh/get a latest page from server if the page is expire, and it is not display "Pages out of date"/"Pages expired". Would it be only worked with session or cookies?
>
>Aston

Sorry about the delay in replying

Sorry, I misunderstood what you were really after, see if the following gives you some clues :
http://www.experts-exchange.com/Web/Web_Languages/JavaScript/Q_20320050.html

in reply to your other message, feel free to e-mail if you need any help