I packaged a quick and easy LoadManager API which I developed awhile back for handling preloading images and swf’s. The preloader works simply by passing in 3 arguments to a static method; the parent movieclip that you want to create the load container movieclip on, a preloading movieclip, and a string which is the swf or image url that you want to load. The LoadManager then returns a movieclip that the asset is loaded in.