Refresh page after file upload

I have a web page where a user can upload a document and then I convert it
to PDF on the fly. During the time it is being converted I redisplay the
list of documents they currently have in their repository and any that are
converting have a little animated gif to denote that the user should refresh
the page to see if it is done being converted.

The problem is that if they refresh they get this message 

"The page cannot be refreshed without resending the information. Click Retry
to send the information again or click Cancel to return to the page that you
were trying to view."

I know what this means, but I don't know how to get around it so if the user
refreshes their page it won't try to upload their file again. If they go to
the menu and re-select this page it works fine (obviously, because another
round trip to the server was made without a document upload for the POST).

Thoughts?

Note that this is running JSF in the background.

Aaron Bartell