[Zope] serving object under different name

Hi. Scene: I have an downloadable object with id/title. When the user clicks on a link, say: <a href="<dtml-var id>"><dtml-var title></a> a requester pops up and asks the user where to store the file with the provided id. Lets say I want to serve the file under the title, not by id, how can this be done? (The requesters pops up and uses the title instead of the id as 'save-as' name.) (I store long, self explaining titles, but short not quite self explaining ids). Thanks for any help, Ingo.