Change Arbortext's default from absolute paths to relative paths?

So, I am writing several manuals in Arbortext, and I have to go into the XML afterward to manually change all the graphics paths from absolute paths to relative paths. This is annoying and time consuming. Is there a setting I can change so that Arbortext always defaults to using relative paths, instead?

I have to do this for multiple documents that all have different file/graphics paths.

Thank you.