Preload external .swf files

I’m sure this has been addressed before, but I can’t really figure out how to apply the tutorials to my case, what I need is very simple, I have a number of buttons that load external .swf files into an existing movie clip instance

like this:

on (rollOver) {
loadMovie(“1.swf”, “container”);
container._x = 0 ;
container._y = 0 ;
}

and this:

on (release) {
loadMovie(“1.1d.swf”, “content1d”);
content1d._x = 0 ;
content1d._y = 0 ;
}

I don’t want to have to change those actions, I just want something very simple to preload all of those .swf files into the cache, at the beginning of the main movie, while a simple “loading” screen displays, progress would be nice but not essential… and then once the movie starts all the external .swf files will be cached and the rollovers and clicks will produce instantaneous loading

this should be pretty simple, like just loading them all at once off the stage where they can’t be seen, but I’m a beginner and don’t really know how to go about it, and don’t have so much time for trial and error

thanks in advance!