Animated Loader

I am having troubles I know this is simple but I can’t find any tutorials on it.
I want to create something like this:

Intro--------Prealoader---------out --MAIN MOVIE.

where there is an intro animation to your preloader then it loads (just stops on the animation till the main movie is loaded) and then it goes to out and then to the main movie.

no bars, percents, nothing like that just a basic animated preloader.

I would appreciate any help
Flash MX btw.