[Zope] Thumbnail Overview ?

Hi, i need a DTML Document and don't know how to create it. I have a Image folder: pcms.image there are many subfolders inside example: pcms.image.logo pcms.image.diverses .... Now i need a DTML Document with the following functions: - Thumbnail Overview for all Images inside a specific folder - change the folder Is there some Document out there ? Sorry for my english ... i am from germany....