libgd graphics in stylesheet

I am experimenting with libgd just having compiled
it into php. What I would like to be able to do
is create an image (with libgd) as a php script and place the
reference into the xsl stylesheet so it will display.
ie) image.php

I am using Sablotron for the transformation.

How do I link this php script into the stylesheet?
-- 
Bill
Amsterdam, NL

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list