Adding Horizontal Rules to Chapter/Part/Section Titles in PDF Output.

Hi,

For Chapter Titles, Section Titles, and Part Titles I need to be able to add a 
horizontal rule across the page either above the title, below, or both. Any 
suggestions for how to modify the XSL titlepage template to make this happen? 
(Or anywhere else where the XSL attribute templates can be customised to do 
this).

(Using Saxon/FOP).

Cheers,
Janeene.