[BNM] PHP Question

[Alan Braddish]

Hi all,

Got a problem with a PHP form.  When a user fills out the form, and clicks
Submit, they are taken to a "thank you" page.  However, if the user clicks
the browser's back button, they go back to the form, but all the form field
contents are blank, as if the page has reloaded?

Is there any way to stop this behaviour so that if they click back, the
forms contents are preserved?

Thanks.
Alan

PS. Running on IIS6.