XML in IE7+ help?

First of all the following code works fine in Firefox, Chrome and Safari. Of course its IE that is having the issue (as always).

Page Code:

<script type="text/javascript">
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.open("GET","../../core/media/media.nl?id=65&c=1065162&h=e7c13890cb0064d02bb4&_xt=.xml",false);
xmlhttp.send();
xmlDoc=xmlhttp.responseXML;
}

document.write("<h3><a href=#>ROCK</a></h3><div>");
document.write("<table width=100% cellspacing=0 cellpadding=3 border=0 id=rockprogram>");
var x=xmlDoc.getElementsByTagName("ROCKPROGRAM");
for (i=0;i<x.length;i++)
  { 
  document.write("<tr><td width=50 style='border-left: 1px solid #CCC; border-top: 1px solid #CCC;'>");
  document.write(x[i].getElementsByTagName("ADD")[0].childNodes[0].nodeValue);
  document.write("</td><td style='border-top: 1px solid #CCC;'>");
  document.write(x[i].getElementsByTagName("NAME")[0].childNodes[0].nodeValue);
  document.write("</td><td style='border-top: 1px solid #CCC;'>");
  document.write(x[i].getElementsByTagName("GENRE")[0].childNodes[0].nodeValue);
  document.write("</td><td style='border-top: 1px solid #CCC;'>");
  document.write(x[i].getElementsByTagName("DETAILS")[0].childNodes[0].nodeValue);
  document.write("</td><td width=300 style='border-right: 1px solid #CCC; border-top: 1px solid #CCC;'>");
  document.write(x[i].getElementsByTagName("PLAYER")[0].childNodes[0].nodeValue);
  document.write("</td></tr><tr><td colspan=5 style='border-top: 1px solid #CCC;'></td></tr>");
  }
document.write("</table>");
document.write("</div>");

Code (markup):

XML Code: (first couple items)

<?xml version="1.0" encoding="utf-8"?>
<CATALOG>
	<ROCKPROGRAM>
		<ADD>Add</ADD>
		<NAME>Name</NAME>
		<GENRE>Genre</GENRE>
		<DETAILS>Details</DETAILS>
		<PLAYER>Player</PLAYER>
	</ROCKPROGRAM>
	<ROCKPROGRAM>
		<ADD>&lt;input type="checkbox" name="program" id="225" value="225"&gt;</ADD>
		<NAME>Backpages</NAME>
		<GENRE>Rock</GENRE>
		<DETAILS>Details</DETAILS>
		<PLAYER>&lt;p id="audioplayer_1" class="audio"&gt;Alternative content&lt;/p&gt; &lt;script type="text/javascript"&gt; AudioPlayer.embed("audioplayer_1", {soundFile: "http://music.muzak.com/content/programs/audio/8.mp3"});&lt;/script&gt;</PLAYER>
	</ROCKPROGRAM>

Code (markup):