How can i make a sprite with intercambiable images

How can i get sprite thats up开发者_StackOverflow中文版dates the image with this interface?

public class DinImageSprite extends Sprite
{
    public function DinImageSprite() { 
        super(); 
    }

    public setImage(a:Class) {

    }
}

Tanks

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Edit your question and elaborate more on what you are passing into the set image function. Or you can be more vague so we can keep on guessing.

public setImage(a:Image) {
  this.addChild( a );
}