In my flash file there is a button name "b1" and a movie clip with instance
name "mu3"
Everything is working fine with the code written below and the output is just
as desired...

Wht actually happens is that a ball moves up to a certain point when a
rollover occurs.... and it comes back when the mouse roll out....

The problem is that whenever i move mouse very fastly over the button b1 ,
only rollover event occurs and not the rollout event.... but , when i do it
slowly , it works fine!
Wht can i do!

on (rollOver) {
mu3.gotoAndPlay(2);

}
on (rollOut) {
mu3.gotoAndPlay(18);

}
on (release) {
nextFrame ();
}

I saw a similar problem in this post
http://www.macromedia.com/cfusion/webforums/forum/messageview.cfm?catid=288&threadid=835160