Noob Menu Navigation Questions

Hello everyone,
I’m currently working on Flash buttons for HTML website.
My intention of this button is that when you rollOver on any button, the size increases and another sub menu appears inside the bigger sized square box. The problem that i faced was that after the rollOver state, I can’t click/rollOver/rollOut on the sub menu buttons. Someone said that because there are movie clips inside another movie clip, that it can only recognize 1 mc.

my action script on the 1st frame of the action layer (_root) was:

var posY = [0,64.5,129,193.5,258, 322.5, 387, 451.5];
function OVER_FN(No){
for(var i = 0; i<8; i++){
if (No==i){
this[“my_mc”+i].onEnterFrame=function(){
var myName = Number(this._name.slice(5));
this._y += (posY[myName]-this._y).14;
this.nextFrame();
};
}else{
this[“my_mc”+i].onEnterFrame=function(){
var myName = Number(this._name.slice(5));
if (No<myName) {
this._y += ((posY[myName]+62.5)-this._y)
.14;
} else {
this._y += (posY[myName]-this._y)*.14;
}
this.prevFrame();
};
}
}
}
//rollover
my_mc0.onRollOver=function(){
OVER_FN(0);
};
my_mc1.onRollOver=function(){
OVER_FN(1);
};
my_mc2.onRollOver=function(){
OVER_FN(2);
};
my_mc3.onRollOver=function(){
OVER_FN(3);
};
//rollout
my_mc0.onRollOut=my_mc1.onRollOut=my_mc2.onRollOut=my_mc3.onRollOut=function(){
OVER_FN();
};

if anyone is willing to help me solve this problem, I’d appreciate it very much.

Thanks!