what do you mean "currently selected material"

Do u mean you have to select a material and be in the material room for it to workt?  Hmm... I need to be able to automate the script from a pz2.  I've seen overlay packages done this way, you select your figure, click the pose and it runs the script.

i can write a pose that executes a script, but dont have a script that works.  I need it to be able to apply the overlay automatically once the pose tells it to run.