Flash advertise thing with fade in/out (swap depths)

hey, sorry for the super confusing title haha, i wasn’t sure what to put.

anyway, I have made a flash advert thing for my mate:


fla is up there as well, just change the .html to .fla

anyway, I want it so that the new image fades in on top of the new on. what is the best way to do this? just make 2 movie clips and keep swapping their depths?