Kirupa Tut - Displaying XML data in flash not working

Hey everyone,
I am trying to get a handle on XML and as such I am going through Kirupas tut on displaying XML.
Unfortunately I cant even get past the first page without something going wrong.

I have saved my inventors.xml and the test page all in the same directory.

The inventors.xml looks like this:

<?xml version="1.0"?>

<inventors>
    <person>
        <name>Thomas Edison</name>
        <comment>Inventor of many things such as the incandescent lightbulb.</comment>
    </person>
    <person>
        <name>Doug Engelbart</name>
        <comment>Invented the mouse at the Stanford Research Institute</comment>
    </person>
</inventors>

The actionscript looks like this:


function loadXML(loaded) {

if (loaded) {

_root.inventor = this.firstChild.childNodes[0].childNodes[0].firstChild.nodeValue;
_root.comments = this.firstChild.childNodes[0].childNodes[1].firstChild.nodeValue;
name_txt.text = _root.inventor;
comment_txt.text = _root.comments;
} else {
  trace("file not loaded!");

}

}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("inventors.xml");

Everything is named perfectly but no matter what I try I keep getting undefined for the dynamic text:

What am I doing wrong?