[Zope] Using a variable for downloaded fileneme

I have the following Python script which allows the user to download an XML file generated by the DTML method 'controlmakeXML'. I want to be able to generate the filename (fname) on the fly from the request but I'm having a problem with the syntax to insert the variable as filename=fname in the script. Can anyone help, it's probably a very simple thing that I am missing! request = container.REQUEST RESPONSE = request.RESPONSE fname=request.me data = context.controlmakeXML RESPONSE.setHeader('Content-Type', 'application/download') RESPONSE.setHeader('Content-Length', len(data)) RESPONSE.setHeader('Content-Disposition','attachment;filename=fname') return data reagards garry