How to use ESRI Map with Mapserver?

[Paul Maine(ATS)]

I have installed MS4W and am using a PHP5 web service to get a map image
(gif)
from ESRI Arcweb Services. How can I use the map image with MapServer? In
other
words, I desire to use this map image as the bottom layer and then use
MapServer
to add additional layers.

Thank You