I am looking for a way to create an opacity mask through JavaScript. My program has the correct items selected, I just can't seem to find any documentation about creating an opacity mask. If I run the program as is, I just need to click one button ( "Make Mask") and the desired process is completed. Of course I would love to find a way to do this programmatically. 
If I cannot access Opacity mask, is there a way to manually do this through grouping and blending or something?
Here is a pic of what I want to do... Thanks for the help
