3 questions reguarding the same object

programming flash
1

ok first take a look at http://ostari.com/ronnie/airbox

my three questions are:
1. Why do my sliding thumbnails snap to the left edge the first time you load it. If you resize, it snaps, but snaps to center.

updateLocations = function () {
    initialWidth = Stage.width;
    initialHeight = Stage.height;
    currentWidth = Stage.width;
    currentHeight = Stage.height;
    contentWidth = thumbSlider._width;
    if (thumbSlider._width<currentWidth) {
        newX = Math.round(initialWidth/2-thumbSlider._width/2);
    } else {
        positionContent();
        newX = Math.round(initialWidth/2-thumbSlider._width/2);
    }
};
updateLocations();
//the amount of space on each edge
buffer = 50;
this.onMouseMove = function() {
    if ((this._xmouse>Math.floor((initialWidth-currentWidth)/2)) && (this._xmouse<Math.floor(initialWidth+2*((currentWidth-initialWidth)/2))) && (this._ymouse>thumbSlider._y) && (this._ymouse<(thumbSlider._y+thumbSlider._height))) {
        if (thumbSlider._width>currentWidth) {
            positionContent();
        }
    }
};
positionContent = function () {
    mousePercent = (this._xmouse+(currentWidth-initialWidth)/2)/currentWidth;
    availMovement = thumbSlider._width-currentWidth+buffer*2;
    newX = Math.floor(-mousePercent*availMovement)-(currentWidth-initialWidth)/2+(buffer*2)/2;
};
if (thumbSlider._width>currentWidth) {
    newX = Math.floor((initialWidth-currentWidth)/2)+buffer;
} else {
    newX = Math.floor(initialWidth/2-thumbSlider._width/2);
}
holder = thumbSlider._x;
easeContent = function () {
    if (newX<>thumbSlider._x) {
        destx = newX;
        posx = holder;
        velx = (destx-posx)/4;
        holder += velx;
        thumbSlider._x = Math.round(holder);
    }
};
thumbSlider.onEnterFrame = function() {
    easeContent();
};
updateLocations();

**
2. I am using movie clip loader to load the images from an xml file, how can I make a little progress bar for each one? I know this code will do it, but how do i make a bar for each thumb loaded?**

myListener.onLoadProgress = function(target:MovieClip, bytesLoaded:Number, bytesTotal:Number):Void {
    amount = Math.floor(((bytesLoaded/bytesTotal)*100));
    loadbar._width = amount;
}

**
3. My last question is easy. My onRollOver and RollOut functions are not working. I put trace commands in there and not even those will fire. Do you see anything odd?**

var thumblength = _root.projectxml.firstChild.childNodes.length;
var myMCL:MovieClipLoader = new MovieClipLoader();
var myListener:Object = new Object();
var thumbDepth = 500;
thumbplaceholder._visible = false;

for (i=0; i<thumblength; i++) {
    var theThumb = "projects/thumbs/" + _root.projectxml.firstChild.childNodes*.childNodes[0].attributes.src;
    thumbLoader.attachMovie("thumbHolder","thumbHolder"+i,thumbDepth+i);
    myMCL.loadClip(theThumb,thumbLoader["thumbHolder"+i]);
    thumbLoader["thumbHolder"+i]._x = i*120;
    thumbLoader["thumbHolder"+i].onRollOver = function() {
        this.alphaTo(70,0.5,"easeOutExpo");
    }
    thumbLoader["thumbHolder"+i].onRollOut = function() {
        this.alphaTo(100,0.5,"easeOutExpo");
    }
}

thanks a lot for any help