autohotkey script

I'm using PSRemote photo booth software. I need AHK script that change the z-layer of the image so that it can rest on top of the live view image. In full screen photobooth mode live view window is shown on the top of background image. I need to put another window with picture over the live view. This window should support black color transparency and make live view below visible (live view is scalable and can be any place).