With this Zope product you can build on the fly navigational buttons.

You take a blank button (no text on it) as template,
then this product will write a text label on it
and will return the new image.

• First install PIL (python image library)
  Installing PIL into Zope for Windows by SmileyChris
  or download and install source from pythonware site
  
  
• download file ButtonBuilder.tgz
  and extract it into products folder of Zope.
  (/usr/local/lib/zope/lib/python/Products/ - OpenBSD)
  I mean to do it into $SOFTWARE_HOME/Products/
  
  
• add an instance of Button Builder and play with it.