[Zope] How to get a raw image?

[Gregory Dudek]

  I need to return a rew image from a URL on my zope server, that
is, I want to return a random gif using something like
<dtml-var "_.random.choice(....)">

so that a user on another server can call my zope URL as

  http://myzopeURL.../randomimage.gif

INSIDE using their HTML of the form <img src="http://myzopeURL.../randomimage.gif">

Anything I try ends up giving back HTML code of the from
   <img src="....my image ID...">  
instead of the raw image data.  Can anybody help?

Greg