Rails - Jun 2009 - file_field_tag : what was the original file name?

My site allows users to upload csv files for processing.  It all works
fine, but on the response I''d like to report something like "Your
file
abc.csv processed OK".

Unfortunately I cannot seem to find the actual original file name in
the params, even though Firebug tells me it''s part of the post.

Any tips?

Thanks....