This tutorial will teach you how to Increase and decrease a Movie Clip using buttons and Action Script in flash 8.
Step 1Create a new flash document, take the Line Tool (N) and draw a "star" like it is shown on the picture below.

Step 2Press Ctrl+A and after that F8 on the keyboard, to convert your "star" into a Movie Clip.
Step 3While your new made Movie Clip ("star") is still selected, open the Properties Panel (Ctrl+F3), and under
type star.

Step 4
Click on Window > Components to open the Components Panel.
Step 5
After that from Components Panel choose Button and using drag 'n' drop technique move it on the stage. See the picture below!

Step 6
While your button is still selected, from the Properties Panel under type ButtonDecrease.
Step 7
Select the button and press Ctrl+D on the keyboard to duplicate it.
Step 8
With the new copy of the Button instance selected, rename the instance to ButtonIncrease.
Step 9
Insert a new layer and name it Action.

Step 10
Click on the first frame of layer Action, open the Action Script Panel (F9), and paste this script:
ButtonIncrease.onRelease = function():Void{
with (star){
_xscale += 7;
_yscale += 7;
}
};
ButtonDecrease.onRelease = function():Void{
with (star){
_xscale -= 7;
_yscale -= 7;
}
};
We're done!
Test your Movie (Ctrl+Enter).
Download source file (.fla)