[Zope] presenting partial page

I have an application that asks users to fill in a form. Users fill in and submit the form which it takes a few minutes to be processed. While is being processed the users still see the form and not the uncompleted page that displays the results. I would like to be able to present to the users a message like "This action will take a few minutes to be completed --Please wait" What is the best way of accomplishing that? TIA Hara