Calling a function of a parent

I’ve been searching around the forum, and couldn’t find a solution. Any help would be very much appreciated…

Ok I have two movies… parent.swf and content.swf, and I’m trying to call a function in my main.swf from my content.swf. Here is the code…

//function in main.swf
function appear (event:MouseEvent):void{, 1, {autoAlpha:1, overwrite:false});

//try to call from content.swf
close_btn.addEventListener(MouseEvent.CLICK, btnClick);

function btnClick(event:MouseEvent):void {

I got an error message as soon as i click on close_btn. It says appear() is not a property or method.

Would someone help me out on this please?