Duplicate movie clip adjustments

[symbolica]

First of all thank you for quick response,
Here are the codes.

This is 1st frame of _root

myBg._width = Stage.width;
dot_mc._x = 0;

var stageL:Object = new Object();
stageL.onResize = function() {
    myBg._width = Stage.width;
    dot_mc._x = 0;
}

Stage.addListener(stageL); 

This one is inside the dot_mc movieclip symbol in the first frame

dots = 75;
for (k=0; k<75; k++){
    duplicateMovieClip(dotclip, "dotclip"+k, k);
} 

And for the last one this code piece is attached to the dotclip inside the dot_mc,

onClipEvent (load) {
    //variables
    width = Stage.width;
    //random x,y, and alpha 
    this._alpha = 20+Math.random()*50;
    //random x and y for flakes
    this._x = -width+Math.random()*(3*width);
    //speed and trigonometric value
    rad = 0;
}
onClipEvent (enterFrame) {
    width = Stage.width;
    // horizontal movement
    xmovement = 0;
    this._x -= Math.cos(rad)+(xmovement-(width/2))/50;
    // vertical movement
    // remove clips when they misbehave (overstep boundaries)
    if (this._x>(width+50)) {
        this._x = -45;
    }
    if (this._x<-50) {
        this._x = width+45;
    }
} 

Hope the hierarchy isn't complex for you...

Thank you very much,