XML + AS headache

[Cheddabeast]

Basically I found a pretty basic flash photo gallery. I'm new to XML, Flash, and Actionscripts so I wasn't really sure what I was doing. The template didn't come with a caption for the pictures so I added a dynamic text box and attempted to use AS. Basically I was trying to make it when you moused over the picture the caption appeared with the text from the XML files. All I can get to come up is undefined. Here is my AS script, what I added is in red so the problem is probably around it.

photo_thumbnail = new Array();
photo_url = new Array();
photo_caption = new Array();

filepath = "photos/";

var flash_xml = new XML();
flash_xml.ignoreWhite = true;
flash_xml.onLoad = function()
{
var node:Array = this.firstChild.childNodes;
for(var i=0;i<nodes.length;i++)
{
photo_thumbnail.push(nodes[i].attributes.thumbnail);
photo_url.push(nodes[i].attributes.url);
photo_caption.push(nodes[i].attributes.caption);
}
}
flash_xml.load(filepath + "flash_thumbnails.xml"

Also

x_middle = Stage.width/2;
y_middle = Stage.height/2;
tn_group.tn._visible = false;
tn_group.setMask( tn_area );
tn_alpha_default = 100;
tn_spacing = 6;
p = 0;
info = "";
desc = "";

for( var i = 0; i < photo_thumbnail.length; i++ )
{
 tn_group.tn.duplicateMovieClip("tn"+i, i);
 
 tn_group["tn"+i].tn_pic.loadMovie( filepath + photo_thumbnail[i] );
 tn_group["tn"+i].tn_pic2.loadMovie( filepath + photo_thumbnail[i] );
 tn_group["tn"+i]._x = i * (tn_group.tn._width + tn_spacing);
 tn_group["tn"+i]._y = tn._y;
 tn_group["tn"+i].tn_pic._alpha = tn_alpha_default;
 tn_group["tn"+i].tn_no = i;
 
 tn_group["tn"+i].tn_button.onRollOver = function()
 {
  this._parent.tn_pic._alpha = 70;
  _root.info =  photo_url[this._parent.tn_no];
  _root.desc =  photo_caption[this._parent.tn.no];
 }
 tn_group["tn"+i].tn_button.onRollOut = function()
 {
  this._parent.tn_pic._alpha = tn_alpha_default;
  _root.info = "";
  _root.desc = "";
 }
 tn_group["tn"+i].tn_button.onRelease = function()
 {
  getURL( photo_url[this._parent.tn_no] );
 }
}
onEnterFrame = function()
{
 if( _ymouse > tn_group._y - 30 and _ymouse < tn_group._y + tn_group._height )
 {
  x_speed = -(_xmouse - x_middle ) / 50;
  if( _xmouse > x_middle + 200 )
  {
   if( tn_group._x + tn_group.tn._width > tn_area._width - tn_group._width + tn_area._x )
    tn_group._x+=x_speed;
  }
  else if( _xmouse < x_middle - 200 )
  {
   if( tn_group._x - tn_group.tn._width < tn_area._x )
    tn_group._x+=x_speed;
  }
 }
}

Finally the XML

<?xml version="1.0" encoding="utf-8"?>
<photos>
	<photo thumbnail="flashmo_028_design.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_029_design.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_030_design.jpg" url="http://www.google.com" caption="insert caption" />
	
	<photo thumbnail="flashmo_031_mask_effect.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_032_mask_effect.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_033_design.jpg" url="http://www.google.com" caption="insert caption" />
	
	<photo thumbnail="flashmo_034_photo_gallery.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_035_color_effect.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_036_skyblue.jpg" url="http://www.google.com" caption="insert caption" />
	<photo thumbnail="flashmo_037_wooden.jpg" url="http://www.google.com" caption="insert caption" />
</photos>

Any ideas why it is coming up with Undefined when I mouseover a picture?

[a_modified_dog]

you define var node:Array
yet you are trying to push arrays with - nodes[i]

node and nodes are different

is this a typo ?
or the cause of your problems ?