I suppose I'm overdue for contributing to the guild. So here's something to help reduce your file size verse tweening for any flash animations you are doing.
First select the frame that you intend to have a particular animation happen at. ensure the specific instances of whatever objects you want to move are named. It doesn't have to be different from the object name, but the code will be looking at the instance's name. In the actions window insert this code:
object.onEnterFrame = function(){
(movement code)
}
Stop;
the object has to be one of the objects in the frame, but it doesn't matter which. You are also not limited to manipulating that one object, the code just needs a start que. So lets say we wanna move ryuk from one side of the screen to the other. We would use this:
ryuk.onEnterFrame = function(){
IF(ryuk._X <400){
ryuk._x+=25;
}
if(ryuk._X>=400){
gotoAndPlay "nextframe";
};
stop;

+= means add the second number to the first variable.
make sure to use _X for position as the .x is for image size.
>= means greater than or equal to.
the first if statement moves ryuk if he's not to the point he needs to be and the second if statement continues play after he gets there. It might be more work than using a tween, but it's a considerable space save.