I would like to make a suggestion on this one to keep code small:

//Give the frame labels the coresponding button name.

home_btn.addEventListener(MouseEvent.CLICK, homeSelected);
about_btn.addEventListener(MouseEvent.CLICK, aboutSelected);
pf_btn.addEventListener(MouseEvent.CLICK, portfolioSelected);
photos_btn.addEventListener(MouseEvent.CLICK, photosSelected);
contact_btn.addEventListener(MouseEvent.CLICK, contactSelected);

//All done in 1 function.
function homeSelected(e:MouseEvent):void{
gotoAndPlay(e.target.name);
}

Many thanks

earthflyer