Preloader for exsisting swf

how do you go about adding a proloader to a pre exsisting movie
I alread designed my movie but need at proloader to give my users something to look at for 220k. all the tutorials show you how to make a proload for an
image you inport into a new movie? can i copy/paste a already made preloader?
last Q… the movie i need a preloader for is loading external swf’s , how do you proload that kind of a movie???