script for setting up presentation

I use DraftSight only to present AutoCAD drawings to my customers.  My drawings always have a black background and various color objects depending on the layer they are on.  I want to change to a white background and black color for the objects.  I know how to do this using menu selections but would like to know how to write a script that I can easily invoke every time I open a drawing.  I would also like to have the script enter the '_PAN command so once the colors are changed I'm ready to pan around the drawing.

 

Thanks for any help!