Actionscript Fadeout Question

1

I am using the following AS to fade out a movieclip after an alotted time, although i can’t seem to get it to work. Here is the code I am using


 onClipEvent (load) {
 fadeIn20=setInterval(fadeStart,20000);
 function fadeStart(){
 clearInterval(fadeIn20);
 fadeI=setInterval(fadeF,80);
 }
 function fadeF(){
 this._alpha -= 3; // i'm assuming you want to fade yourMC out
 if(this._alpha<=0){
 clearInterval(fadeI);
 }
 } 
 }