Help with Photo Gallery Tutorial

Tutorial Link: http://www.kirupa.com/developer/mx/photogallery.htm

The error I’m getting when I try to play the movie/photo album,
NaN
NaN
(etc. over and over again until I x out. It displays in the output box after I transition from the first picture to either direction.)

I’m not sure what he means by d=direction. Am I supposed to fill a variable in? If so, where do I put that number? I’m grateful for any help.

My alteration of the code:

//Code written by sbeener (suprabeener)
/*
i wrote this code, but you can use and abuse it however you like.
the methods are defined in the order which they occur to make it easier to understand.
*/
// variables ------------------------------------------
// put the path to your pics here, include the slashes (ie. “pics/”)
// leave it blank if they’re in the same directory
this.pathToPics = “http://web.utk.edu/~jwatso13/vacation/”;
// fill this array with your pics
this.pArray = [“v2.jpg”, “v3.jpg”, “v4.jpg”, “v5.jpg”, “v6.jpg”, “v7.jpg”];
this.fadeSpeed = 20;
this.pIndex = 0;
// MovieClip methods ----------------------------------
// d=direction; should 1 or -1 but can be any number
//loads an image automatically when you run animation
loadMovie(this.pathToPics+this.pArray[0], _root.photo);
MovieClip.prototype.changePhoto = function(d) {
// make sure pIndex falls within pArray.length
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() {
// specify the movieclip to load images into
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;
}
};
// Actions -----------------------------------------
// these aren’t necessary, just an example implementation
this.onKeyDown = function() {
if (Key.getCode() == Key.LEFT) {
this.changePhoto(-1);
} else if (Key.getCode() == Key.RIGHT) {
this.changePhoto(1);
}
};
Key.addListener(this);