[Zope] URL relative to document, not folder. How to fix?

Hi, I'm new. I loaded a bunch of html documents into a couple of folders under CMF and discover that the usual notation for a relative link <a href="doc2.html">doc2</a> looks for doc1.html/doc2.html ! Because of inheritance (?), it finds the document as long as the calling and called documents are in the same folder, but if I want a document in another folder <a href="../introduction.html">Up for Intro</a>, it doesn't work. It seems that the path is relative to the document and not the folder, so to speak. Have I got something misconfigured? Thanks, Jim