fade array of mcs after all mcs alpha is 100

[gvb7676]

I have ten movie clips on stage.
Alpha is 0.
When you rollOver each mc, each mc alpha goes to 100 and stays 100.

i would like all mcs alpha going to 0 once all mcs alpha is 100.

import caurina.transitions.Tweener;
import flash.filters.GlowFilter;

I am using this code for the fading out part but does not seem to work and gives me current_mc alpha = undefined.

Been working on this for over a week, if anyone knows how to solve it, it would be greatly appreciated.

var btnArray:Array = new Array(btn1_btn, btn2_btn, btn3_btn);

var i = 0;
var current_mc;
var all_alphas_are_100 = true;
for (i=0; i< btnArray.length; i++){
current_mc = root[btnArray[i]];
trace ("current_mc alpha : " + current_mc._alpha)
if (current_mc._alpha != 100){
all_alphas_are_100 = false;
}
};