Multiple file preloader

I need to preload 12 images and 12 mp3 files, and the xml file for my text, at the beginning of my swf file.

Is there any fairly easy way to do this? I’ve searches for tutorials/examples, but can’t find anything helpful.
Is there a way to preload a folder, where I can keep these files?
Or some way to get all files preloaded in the same preload progress?

I hope someone can help me out on this!