Flash CS3 Documentation

Programming ActionScript 3.0 > Display programming > Loading display content dynamically

Loading display content dynamically

You can load any of the following external display assets into an ActionScript 3.0 application:

A SWF file authored in ActionScript 3.0--This file can be a Sprite, MovieClip, or any class that extends Sprite.
An image file--This includes JPG, PNG, and GIF files.
An AVM1 SWF file--This is a SWF file written in ActionScript 1.0 or 2.0.

You load these assets by using the Loader class.

Flash CS3