Well, what you do is you add +5 or -5 to the current _alpha value.
Meaning you will increase or decrease the current alpha value by 5. It's
like writing instance._alpha = instance._alpha - 5 (or + 5). Of course,
you can use some sort of loop to update all movieclips/stars i.e:
var starsCount = 50;
var i =0;
while ( i < starsCount ) {
var currentStar = _root[ "star" + i ]._alpha ;
currentStar._alpha = currenStar._alpha + currentStar.alphaSpeed;
i++;
}
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