Custom Formmail Redirect Question


I know I can redirect the submitter of a form (using the formmail script from DH) to a custom webpage. What I’d like to do is to be able to show (print) one field that was submitted from the form on my custom submission “confirmation” page like the default response page displays. Does anyone know how I can code this in the custom page that I will redirect the submitter to?

Thanks in advance for any help anyone can give