clearing a parameter using Apache::Request

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I have a script that can submit back to itself.  If the script is being 
entered from somewhere else, then the "submitted" form parameter is not 
present and the form is presented.  If the parameter "submitted" is 
present, then I want to process the form.  However, if the processing 
"fails", I want to re-run the script, but only after deleting the 
"submitted" parameter.  In the CGI world, one simply does 
$cgi->delete('submitted').  It seems that Apache::Request does not have 
this method.  Is there a simple way to either add or delete parameters 
to the request?

Thanks,
Sean