problème avec movie

this.pathToPics = "images/";

this.pArray = ["001.jpeg", "002.jpeg", "003.jpeg", "004.jpeg"];
this.fadeSpeed = 20;
this.pIndex = 0;

loadMovie(this.pathToPics+this.pArray[0], _root.photo);
MovieClip.prototype.changePhoto = function(d) {
    
    this.pIndex = (this.pIndex+d)%this.pArray.length;
    if (this.pIndex<0) {
        this.pIndex += this.pArray.length;
    }
    this.onEnterFrame = fadeOut;
};
MovieClip.prototype.fadeOut = function() {
    if (this.photo._alpha>this.fadeSpeed) {
        this.photo._alpha -= this.fadeSpeed;
    } else {
        this.loadPhoto();
    }
};
MovieClip.prototype.loadPhoto = function() {

    var p = _root.photo;

    p._alpha = 0;
    p.loadMovie(this.pathToPics+this.pArray[this.pIndex]);
    this.onEnterFrame = loadMeter;
};
MovieClip.prototype.loadMeter = function() {
    var i, l, t;
    l = this.photo.getBytesLoaded();
    t = this.photo.getBytesTotal();
    if (t>0 && t == l) {
        this.onEnterFrame = fadeIn;
    } else {
        trace(l/t);
    }
};
MovieClip.prototype.fadeIn = function() {
    if (this.photo._alpha<100-this.fadeSpeed) {
        this.photo._alpha += this.fadeSpeed;
    } else {
        this.photo._alpha = 100;
        this.onEnterFrame = null;
    }
};

MovieClip.prototype.scaleTo=function(m){
  with(this){
  _xscale=_yscale=100;
  var p=new Object({H:_height/m._height,W:_width/m._width});
  p=(p.H>p.W) ? p.H : p.W;
  _yscale=_xscale=100/p;
  _x=m._x-_width/2, _y=m._y-_height/2;  
}};

Number.prototype.Rnd=function(){
  var num=this
  var newRnd=Math.round(Math.random()*(num-1)-(-1));
  while((newRnd==this.Rnd.old)||(newRnd==this.Rnd.varyold)){
      newRnd=Math.round(Math.random()*(num-1)-(-1));
    }
    trace( this.Rnd.veryold+ " "+this.Rnd.old+" "+newRnd);
  this.Rnd.veryold=this.Rnd.old;
  this.Rnd.old=newRnd;
  return(newRnd);
};

//need some pictures Picture1.jpg, Picture2.jpg, Picture3.jpg
//and a movieClip that is _visible==false to scale to "myMask".
//and a movieClip to act as a button

_global.noPictures=3;

assessLoad = function(clip, loadFunc,myMask) {
      if ((clip.getBytesLoaded()/clip.getBytesTotal() == 1)&&(clip._width>4)) {
         clip[loadFunc](myMask);
         clip._alpha=1;
         clip.onEnterFrame=function(){
             if(this._alpha<100){
                this._alpha+=5;
            } else {
                this._alpha=100;
                delete this.onEnterFrame;
            }
         }
         clearInterval(loadInterval);
      }
};
newPic_btn.onRelease=function(){newPic(this,"clip")};
function newPic(clip){
  _root["clip"+this.status].swapDepths(50);
  this.status=!this.status;
  var genNum=noPictures.Rnd(noPictures);
  var pic = "Picture"+genNum+".jpg";
  trace(pic);
  var clip=_root.createEmptyMovieClip("clip"+this.status*1,100);
  clip._x=1000;
  clip._y=1000;
  clip.loadMovie(pic);
  if(loadInterval!=undefined){
    clearInterval(_root.loadInterval);
  }
  _root.loadInterval = setInterval(_root, "assessLoad", 40, clip, "scaleTo", _root.myMask);
};
size.onPress=function(){
this.startDrag();
this.onEnterFrame=function(){
rescale(this,_root.myMask);
}
}
size.onRelease=function(){
this.stopDrag();
rescale(this,_root.myMask);
this.onEnterFrame=null;
}
function rescale(mc,masc){
    masc._width=2*Math.abs(mc._x-masc._x);
    masc._height=2*Math.abs(mc._y-masc._y);
    s=_root.newPic.status;
    _root["clip"+s*1].scaleTo(masc);
    _root["clip"+!s*1].scaleTo(masc);
}
rescale(size,_root.myMask);
newPic(newPic_btn,"clip");