转换图形类型为gif的工具类方法，可以在尽可能保持图形效果的前提下，压缩图片容量-Conversion graphics gif type of instrument class method, you can as far as possible under the premise of graphics, compressed picture capacity

提供一个flex 3 用来支持播放GIF图片，希望大家喜欢-To support a flex 3 play GIF images, hope you like