Convert AC2 to AC3 for me

I was given this code from AS2, but how would it look like in AC3 is the question I am having... Someone please help as I am clueless with AS3.

var tnNr;
spacing = 10;
container._alpha = 0;
var curLength;
MovieClip.prototype.loadPic = function(pic, id) {
	info.text = "";
	this._alpha = 0;
	this.loadMovie(pic);
	temp = this._parent.createEmptyMovieClip("temp2", 998);
	temp.onEnterFrame = function() {
		var t = container.getBytesTotal(), l = container.getBytesLoaded();
		if (Math.round(l/t) == 1 && container._width != 0 && container._height != 0) {
			var w = container._width+spacing, h = container._height+spacing;
			border.resizeMe(w, h, id);
			delete this.onEnterFrame;
		}
	};
};
MovieClip.prototype.resizeMe = function(w, h, id) {
	var speed = 3;
	container._alpha = 0;
	this.onEnterFrame = function() {
		this._width += (w-this._width)/speed;
		this._height += (h-this._height)/speed;
		if (Math.abs(this._width-w)<1 && Math.abs(this._height-h)<1) {
			this._width = w;
			this._height = h;
			container._x = this._x-this._width/2+spacing/2;
			container._y = this._y-this._height/2+spacing/2;
			info._y = Math.round(this._y+this._height/2+spacing/2);
			container._alpha += 5;
			if (container._alpha>90) {
				info.text = id;
				container._alpha = 100;
				delete this.onEnterFrame;
			}
		}
	};
};
function galleryChoice(q) {
	pArray = new Array();
	tArray = new Array();
	iArray = new Array();
	my_xml = new XML();
	for (var j = 0; j<curLength; j++) {
		this.th_nav["thmb"+j].removeMovieClip();
	}
	my_xml.ignoreWhite = true;
	my_xml.onLoad = function(loaded) {
		if (loaded) {
			gallery = this.firstChild.childNodes[q];
			curLength = gallery.childNodes.length;
			for (var i = 0; i<gallery.childNodes.length; i++) {
				pArray.push(gallery.childNodes[i].attributes.source);
				tArray.push(gallery.childNodes[i].attributes.thumb);
				iArray.push(gallery.childNodes[i].attributes.title);
			}
		}
		delay = setInterval(makeButtons, 50);
	};
	my_xml.load("gallery.xml");
}
function makeButtons() {
	tnNr = 0;
	clearInterval(delay);
	for (var i = 0; i<tArray.length; i++) {
		var thb = th_nav.thmb.duplicateMovieClip("thmb"+i, 1000+i);
		thb.id = i;
		thb._x = i%3*50;
		thb._y = Math.floor(i/3)*50;
	}
	loadButtons();
}
function loadButtons() {
	var tbox = th_nav["thmb"+tnNr].box;
	tbox.loadMovie(tArray[tnNr]);
	temp = this.createEmptyMovieClip("tmp"+tnNr, 999);
	temp.onEnterFrame = function() {
		bt = tbox.getBytesTotal();
		bl = tbox.getBytesLoaded();
		if (bt == bl && bt>4) {
			nextButton();
			delete this.onEnterFrame;
		}
	};
}
function nextButton() {
	if (tnNr<tArray.length-1) {
		tnNr++;
		loadButtons();
	} else {
		activateButtons();
	}
}
function activateButtons() {
	mainButtons();
	for (var i = 0; i<pArray.length; i++) {
		var but = th_nav["thmb"+i];
		but.id = i;
		but.onRelease = function() {
			container.loadPic(pArray[this.id], iArray[this.id]);
			disButtons2(this.id);
		};
	}
	container.loadPic(pArray[0], iArray[0]);
	disButtons2(0);
}
butArray = new Array();
butArray = ["gal1_btn", "gal2_btn", "gal3_btn", "gal4_btn"];
function mainButtons() {
	for (var i = 0; i<butArray.length; i++) {
		this[butArray[i]].id = i;
		this[butArray[i]].onRelease = function() {
			galleryChoice(this.id);
			disButtons(this.id);
		};
	}
}
function disButtons2(d) {
	for (var i = 0; i<tArray.length; i++) {
		if (i != d) {
			this.th_nav["thmb"+i].enabled = 1;
			this.th_nav["thmb"+i].box._alpha = 100;
		} else {
			this.th_nav["thmb"+i].enabled = 0;
			this.th_nav["thmb"+i].box._alpha = 50;
		}
	}
}
function disButtons(d) {
	for (var i = 0; i<butArray.length; i++) {
		if (i != d) {
			this[butArray[i]].enabled = 1;
			this[butArray[i]].gotoAndStop(1);
		} else {
			this[butArray[i]].enabled = 0;
			this[butArray[i]].gotoAndStop(2);
		}
	}
}
disButtons(0);
galleryChoice(0);

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