Otra pregunta sobre sintaxis

this.attachMovie(menuBot, "pequena"+i, i%5+10);

function criamenu(inicio) {
posX = -83;
posY = 0;
for (var i = inicio; i<inicio+5; i++) {
//trace()
this.attachMovie(menuBot, "pequena"+i, i%5+10);
var item:Object = this["pequena"+i];
item.num = i+1;
var foto:String = meuXML.childNodes[i].attributes.foto;
item.foto = (meuXML.childNodes[i].attributes.foto);
//item.desc = (meuXML.childNodes[i].attributes.desc);
item.alvo_peq.loadMovie(path+"peq/"+foto+"_resize.JPG");
//_root.desc.desc2.desc_txt.text = meuXML.firstChild.attributes.desc;
this._parent.existem.text = meuXML.childNodes.length;
item._x = posX += (item._width)+3;
item._y = posY;
item.bt.useHandCursor = false;
item.bt.onRollOver = function() {
_root.atual = item.num;
//_root.desc_thumb.desc2.desc_txt.text = this._parent.desc;
//_root.desc_thumb.gotoAndPlay(2);
var som:Sound = new Sound();
som.attachSound("som");
som.start();
};
item.bt.onRollOut = function() {
//_root.desc_thumb.gotoAndPlay(7);
};
item.bt.onRelease = function() {
_root.desc.desc2.desc_txt.text = this._parent.desc;
_root.alvo_grande.loadMovie("grande/"+this._parent.foto+".jpg");
};
}
}