Modifying image paths

I tend to write my raw docbook with a single image directory as a 
subdirectory of the article.  As a result, my Figures look like this...

<figure id="Graphic_001"><title>Project Builder - New Project 
Assistant</title>
         <mediaobject>
           <imageobject>
             <imagedata fileref="images/Graphic_001.png" format="PNG" />
           </imageobject>
         </mediaobject>
</figure>

When it's time to publish, I need to move the images from that local 
reference to a remote server, so the URL would need to change to

	http://graphics.server.com/Article/ArticleName/images/Graphic_001.png


I could pre-process the xml through an xsl that modifies the imagedata 
fileref attribute to point to the final location, and then run those 
results through the docbook-xsl but I'm hoping there might be a way to 
do it in one swoop.

Thanks

Scott