I was hoping I could get a little help. I haven't done much of firework photography but managed to get a few decent shots last night and I'm keen to combine the good ones (about 4 in total) into one image that has all images visible stacked ontop of/behind each other. I am using CS5 and I'm just a little unsure about the process. Photomerge doesn't seem to be helping me out. Is there some way to do it using layer masks? Any help will be greatly appreciated and thanks in advance!