You can make any kind of animated flash movie only by writting Programming language or Action Scripts in Macromedia Flash.

Step One
Open Macromedia Flash MX. Now, select the Oval Tool (o) or Rectangle Tool (r) and make a circle or rectangle.
Step Two
Now go to Insert>Convert to Symbol and select 'Movie Clip' and press OK.

Step Three
In the Action Panel (Window>Actions or F9), choose 'Expert Mode' and type the code below.

onClipEvent (load) { xdirection=random(20)-10; ydirection=random(20)-10; } onClipEvent (enterFrame) { if(this._x>=630){ this._x=0; } else if(this._x<=0) { this._x=630; } else if(this._y>480) { this._y=0; } else if(this._y<=0) { this._y=480; } this._x=this._x+xdirevtion; this._y=this._y+ydirection; } Step Four
Now click Control>Test Movie (Ctrl+Enter) and you will see the circle/rectangle you've made is moving as it wish.
Now it's your turn to make some changes to the Action Script and see how does the animation looks like. In that way, you will
know and learn more about the action script.