_root.mc._alpha == 100

Hi. Need some help.

I have this code. It works fine when i press a button.
[AS]

if (_root.mc._alpha == 100) {
this.onEnterFrame = function() {
speed = 50;
alpha = 0;
a = alpha - _root.mc._alpha
_root.mc._alpha += a/speed;

}

[/AS]

What I need?
I need to know how can I trace the _alpha value of the mc and when the value is 0 a movie clip is loading in the same mc.

Thanks in advance.

:beer: