How to make a Preloader for these functions?

programming flash
1

How can I create a preloader for these functions?

I am trying to load external .swf inside of a target. See the example bellow.

_root.mc_menu.mc_01.onRelease = function(){
  loadMovie("profile.swf", _root.mc_target);
};

_root.mc_menu.mc_02.onRelease = function(){
  loadMovie("photo.swf", _root.mc_target);
};

Cheers,
Diego