Automatic loarding

Hey,

This is probably a real newbie question, but I would like my first _mc to load once the page itself is done loading. Here is the actionscript i’m using for my buttons to load the _mc accordingly.

var btnNum;
function buttonHandler(who:Number){
if(btnNum==who)return;
_root.container_mc[“menu”+btnNum+"_mc"].play();
_root.container_mc[“menu”+who+"_mc"].play();
btnNum=who;
}
_root.buttons_mc.home_btn.onRelease = function(){
_root.buttonHandler(1);
}
_root.buttons_mc.portfolio_btn.onRelease = function(){
_root.buttonHandler(2);
}
_root.buttons_mc.favorites_btn.onRelease = function(){
_root.buttonHandler(3);
}
_root.buttons_mc.merchandises_btn.onRelease = function(){
_root.buttonHandler(4);
}
_root.buttons_mc.contact_btn.onRelease = function(){
_root.buttonHandler(5);
}

I would really appreciate the help

thanks in advance