如何加载几个外部图像;得到无法转换为类

I'm trying to load a bunch (about 100) of images into memory, so I can display them at various times. Originally I had simply embedded them, but that of course resulted in the swf file being larger than I wanted. So now I'm trying to change it to load them in the background because they aren't needed immediately.I'm trying to load a bunch (about 100) of image