[Zope] Impossibly long urls

Hello folks, Can anyone explain why my Zope apps generate loooooooooooong urls? It seems that each action (clicking a button or an href) results in the target (the object being called) being appended to the current url which is submitted to the server. I've pored over the various Zope references but nothing sticks out as obvious. I've tried specifying the path directly to a Zope object in both Python scripts and dtml documents, and also used relative linking where possible. The effect is always the same and apart from causing the server to overwork it also leads to problems with database operations. Any help will be much appreciated. cheers David