Movie Clip Button Help!

Hello,
I’ve been doing alot of tuts on Lynda.com trying to learn AS3 which have been great but im really struggling on trying to create an animated movie clip button within another movie clip on the stage. The instance name of the movie clip that contains my button is “topLeft”. Where do i need to specify the “topLeft” instance in my code in order for the button animation on rollover and rollout to work? Somwhere as a syntax? Then on click event goes to another movieclip that plays a frame label. The instance of the movie clip that I want to communicate is titled “mainSite” with the target frame label of “startAnim”. My code that I have so far is below: Thanks for your help!

stop();
btn1.buttonMode = true;
btn1.addEventListener(MouseEvent.ROLL_OVER, overstate);
btn1.addEventListener(MouseEvent.ROLL_OUT, outstate);

function overstate(event:MotionEvent):void
{
event.target.gotoAndPlay(“over”);
}
function outstate(event:MotionEvent):void
{
event.target.gotoAndPlay(“out”);
}