Mine

_root.createEmptyMovieClip("wrapper", this.getNextHighestDepth() );
/*
I'm trying to attach an image that is in the library.
wrapper
	-> Background Image
	-> dynamic text...


"Blank_Scroll.png" is a bitmap that's inside the library.
	-> instance name is set to "Blank_Scroll"

*/
wrapper.createEmptyMovieClip("Scroll", this.getNextHighestDepth() );
this.attachMovie("Blank_Scroll", "imgScroll", this.getNextHighestDepth(), {_x:0, _y:0});