applescript: keystroke when right-click is released?

Hi, I am using photoshop, and have been trying to make a script that will create a new layer (command + shift +n) when I release the right mouse button. Sorry if this is a very simple task and a stupid question, but I know nothing about applescript, and have spent the past two hours trying to figure this out. If it is easier, the keystroke on the mouse click would probably work also. Any help would be greatly appreciated!
thanks