[Zope] Recursive method

I want to use a recursive method do draw the navigation tree for my site. I do not want to use the tree tag to iterate through the subfolders because the question-mark in the tree-query might obscure pages of the site to search engines. How can one call a method from within a method passing variables to that method? How does one define a method which accepts certain parameters eg. if someone can translate this in to dtml for me this would be a great help: recursive-dmtl-method(variable folder) in folder if document then makeHREF to document if folder.hassubfolders then recursive-dtml-method(folder) -------------------------------------- This would be of great help. Roché