Flash Preloader

Please see my Flash file. What this file does is that it loads an external movie to a holder in numerical order (P1, P2, ... and so on). Every time user clicks on the "NEXT" button, this file will load the next movie. There's a white screen transition for about 2 seconds before the next movie is loaded. I would like to have a preloader that either a. loads all the external movies at the beginning (there are 160 movies with total size ~ 5MB) OR b. loads the next movie in the background while user on current movie. This preloader might need to be in the individual external movies. The objective is to eliminate if not entirely, as much as possible the delay in transition between pages.