Undefined and clueless

Okay, I’ve searched all over these boards and while finding some topics regarding this, I’ve not been able to find a fix for this. Can anybody help with the xml gallery “undefined” issue when clicking on the image that’s attached to a link? The image is setup to open a url specified in the xml file, however when the URL is clicked, and undefined error page is displayed, such as http://www.website.com/undefined is displayed in the address bar.
Here’s the AS I’m using, starting on line 51, what am I doing wrong???

function loadXML(loaded) {
    if (loaded) {
        xmlNode = this.firstChild;
        image = [];
        description = [];
        thumbnails = [];
        link = [];
        total = xmlNode.childNodes.length;
        for (i=0; i<total; i++) {
            image* = xmlNode.childNodes*.childNodes[0].firstChild.nodeValue;
            description* = xmlNode.childNodes*.childNodes[1].firstChild.nodeValue;
            thumbnails* = xmlNode.childNodes*.childNodes[2].firstChild.nodeValue;
            link* = xmlNode.childNodes*.childNodes[3].firstChild.nodeValue;
            thumbnails_fn(i);
        }
        firstImage();
    } else {
        content = "file not loaded!";
    }
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("pc_photo.xml");
///////////////////////////////////// 
listen = new Object();
listen.onKeyDown = function() {
 if (Key.getCode() == Key.LEFT) {
  prevImage();
 } else if (Key.getCode() == Key.RIGHT) {
  nextImage();
 }
};
Key.addListener(listen);
previous_btn.onRelease = function() {
 prevImage();
};
next_btn.onRelease = function() {
 nextImage();
};
///////////////////////////////////// 
p = 0;
this.onEnterFrame = function() {
    filesize = picture.getBytesTotal();
    loaded = picture.getBytesLoaded();
    preloader._visible = true;
    if (loaded != filesize) {
        preloader.preload_bar._xscale = 100*loaded/filesize;
    } else {
        preloader._visible = false;
        picture.onPress = function() {
            getURL(this.link, "_blank");
        };
        if (picture._alpha<100) {
            picture._alpha += 10;
        }
    }
};
function nextImage() {
 if (p<(total-1)) {
  p++;
  if (loaded == filesize) {
   picture._alpha = 0;
   picture.loadMovie(image[p], 1);
   desc_txt.text = description[p];
   picture_num();
  }
 }
}
function prevImage() {
 if (p>0) {
  p--;
  picture._alpha = 0;
  picture.loadMovie(image[p], 1);
  desc_txt.text = description[p];
  picture_num();
 }
}
function firstImage() {
 if (loaded == filesize) {
  picture._alpha = 0;
  picture.loadMovie(image[0], 1);
  desc_txt.text = description[0];
  picture_num();
 }
}
function picture_num() {
 current_pos = p+1;
 pos_txt.text = current_pos+" / "+total;
}
function thumbNailScroller() {
 // thumbnail code! 
 this.createEmptyMovieClip("tscroller", 1000);
 scroll_speed = 10;
 tscroller.onEnterFrame = function() {
  if ((_root._ymouse>=thumbnail_mc._y) && (_root._ymouse<=thumbnail_mc._y+thumbnail_mc._height)) {
   if ((_root._xmouse>=(hit_right._x-40)) && (thumbnail_mc.hitTest(hit_right))) {
    thumbnail_mc._x -= scroll_speed;
   } else if ((_root._xmouse<=(hit_left._x+40)) && (thumbnail_mc.hitTest(hit_left))) {
    thumbnail_mc._x += scroll_speed;
   }
  } else {
   delete tscroller.onEnterFrame;
  }
 };
}
function thumbnails_fn(k) {
 thumbnail_mc.createEmptyMovieClip("t"+k, thumbnail_mc.getNextHighestDepth());
 tlistener = new Object();
 tlistener.onLoadInit = function(target_mc) {
  target_mc._x = hit_left._x+(target_mc._width+5)*k;
  target_mc.pictureValue = k;
  target_mc.onRelease = function() {
   p = this.pictureValue-1;
   nextImage();
  };
  target_mc.onRollOver = function() {
   this._alpha = 50;
   thumbNailScroller();
  };
  target_mc.onRollOut = function() {
   this._alpha = 100;
  };
 };
 image_mcl = new MovieClipLoader();
 image_mcl.addListener(tlistener);
 image_mcl.loadClip(thumbnails[k], "thumbnail_mc.t"+k);
}