[Zope] Random images--but with a caveat

I'm trying to do random image generation on our site, and I've found lots of messages that suggest using whrandom inside a DTML tag like so: <dtml-var expr="_.whrandom.choice(objectValues('Image'))"> Or code to that effect... But here's my catch: I need to check the image that is returned randomly for a Cutline property. If the property is not there, I need to kick that image out and randomly grab another that does have a Cutline. I'm thinking a Python Script would be better suited for this, but I can't seem to get the syntax to work out the way it should. Any ideas? Thanks! - Chris -- Cmuldrow @ fredericksburg.com