[Zope] String to object ID

[Goodrichs]

We have a short snippet of code that builds an image name from properties
when a web page is called. We need to use this string to directly call the
image object and display it in the page. For the life of me I cannot figure
out how to coerce a string into an object id.

Any hints?

currently:

<dtml-with "_.namespace(imagename='images.hd' + section)">
  <dtml -var imagename>
</dtml-with>

this correctly prints the name of the image object we want.
'images.hd.thisimage'

How do I use that to display the image?

DAve.