I’m doing this sort of from memory so please correct me if I’m wrong. Just having to explain about the animation thing for school.
To make a motion tween in Flash CS3, you have to start with a new file. Put a shape in the image and then go to about the 20th frame and right-click it. Make a new keyframe and put the same shape in a new position. When that’s done, you right click in-between the frames and click on motion tween to get it moving.
To make a shape tween, you start out practically the same but when you reach the part of moving the shape, you put a different shape in instead. And instead of clicking motion tween, you click the one right under it saying shape tween.