Toggling a movieclip. (play and stop)

Hello again folks,

I did kirupas tutorial on tell targets found here:

http://www.kirupa.com/developer/flash5/telltarget.htm

I know the code for controlling the clip now is

 
on (release) {
cheese.gotoAndPlay("start");
}
 

What code would I use if I wanted to stop the animation clicking on the same button?

Thanks again for any help you could give.

on (release) {
playing = !playing;
if (!playing) {
cheese.gotoAndPlay(“start”);
} else {
cheese.stop();
}
}

Check the attachment