How do i autorefresh a site that popups a box that says: The page cannot be refreshed without resending the information... Press Retry or Cancel. Is this possible?

Thanks!

no, this cannot be automated from a web site. Only via a plugin or a program running on the user pc.

Or, change your form to send datas via get rather than post, and this message will not reappears.
It happens only when you get back to a page accessed with a post from a form.