[Zope] images in trees.

I may be overlooking the obvious, but what am I doing wrong here? <dtml-tree content branches_expr="objectValues(['Folder', 'DTML Document'])" sort=order > <dtml-if expr="meta_type == 'Folder'"> <dtml-var title_or_id> <dtml-else> <dtml-if expr="id == 'fozcoa'"><dtml-var fozgif></dtml-if> <dtml-if expr="id == 'cnart'"><dtml-var cnartgif></dtml-if> [snip stuff that generates URL] <dtml-var title_or_id></a> The tree displays, but I cannot get the images (fozgif & cnartgif) to display. There is a document inside content with the id fozcoa and another with the id cnart. -- ~mindlace