theres another way to do this one, not much different but if u invert the dup layer you end up lighting the higlights only, or something like that...
layer mask>reveal all
apply image (make sure invert is checked)
blending mode to screen
almost the same but just thought i'd share-might make a difference for someone. my examples not too great, cause it actually looks better just screened, but on some photos where the background is already where you want it i think this could be helpful. just think of it as something else to do when you're bored [img]/ubbthreads/images/graemlins/smile.gif[/img]