[Zope] Checking if an image exists/simple question

[H.G.J. van der Linde]

Hi,

We have a sql database with employee information. Every employee record has
an MWID field.
Photo's of the employees are stored in a Zope folder (mwfoto) where the id
of every photo has MWID as its name.
So we can display the photo like this:

<img src="/psychologie/mwfoto/<dtml-var mwid>"

This works fine. Now I want to check if a photo exists, and if not, display
some other info. In some sort of Zope pseudocode:

<dtml if exist(mwid)>
  showphoto
  <dtml else>
    showanotherveryinterestingpicture
</dtml-if>

How do I do this?

Your help is very much appreciated,


Henny van der Linde
Leiden University
linde@fsw.leidenuniv.nl