Pre Loader for SWF file

I may be way over-thinking this, but how can I make a preloader for a swf?

I know one method would be to load the swf file into another movie and monitor its progress using a loader instance. But is it possible to know the bytesLoaded and bytesTotal of a swf file from within that same swf file?

I’ve just been given this task and Im completely spacing on the best way to accomplish it.