Duplicate movie clip adjustments

Hello,

I have found a little FLA which demonstrates how the duplicate movie clip can be used.

I tried to simplify and adjust the AS according to my needs. With some part i was successful but with some i wasn't.

My first problem is,
i want to be able to set the beginning X position of the clips as "0" in X values. but when i assign "0" to the this._x , it naturally generates/duplicates all the clips at the same point. What I'm trying to achieve by doing this is, when the stage is scaled in means of width my clips should start to originate from the very left of the stage whatever the stage's width is.

my second question is how can i adjust the speed?
When I stretch the stage width they(duplicated clips) all speed up in order to travel the whole stage in the same amount of time as they do with the initial/beginning stage width. I want the speed to stay constant whatever the distance is.

I'm sure you'll have more idea on what I'm talking about if you can take a look at the attached FLA. You'll have a better idea about my intention.

THANK YOU ALL,

can u post the code instead ..cheers

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

This is 1st frame of _root

PHP Code:

---

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

PHP Code:

---

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,

PHP Code:

---

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,

Actually my aim is to create a "traffic" animation from side view. 2D.
And i want my cars(dots in this case) to move from left to right appearing at the very left edge of the stage and disappearing at the very right edge regardless the width of the stage. And travelling the stage with a constant speed again regardless of the total width.
If i give x a value of zero to make them generate at the far left side of the stage, then all the dynamically created movieclips overlap and act as one dot.

Any ideas? I need this to be done asap... any idea or help is greatly appreciated.