请帮忙解答

<html>
<head>
<script type="text/javascript">
var xmlDoc;
function loadXML()
{
if (window.ActiveXObject)
{
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async=false;
xmlDoc.load("1.xml");
getmessage();
}
else if (document.implementation && document.implementation.createDocument)
{
xmlDoc=document.implementation.createDocument("","",null);
xmlDoc.load("1.xml");
xmlDoc.onload=getmessage;
}
else
{
alert('Your browser cannot handle this script');
}
}function getmessage()
{
//alert(xmlDoc.getElementsByTagName("Treenode")[0].attributes["1"].name);
document.getElementById("to").innerHTML=xmlDoc.getElementsByTagName("Treenode")[0].attributes["0"].value;
document.getElementById("from").innerHTML=xmlDoc.getElementsByTagName("Treenode")[0].attributes["1"].value;
document.getElementById("message").innerHTML=xmlDoc.getElementsByTagName("Treenode")[0].attributes["2"].value;
}
</script>
</head><body onload="loadXML()">
<h1>xml test</h1>
<p><b>To:</b> <span id="to"></span><br />
<b>From:</b> <span id="from"></span><br />
<b>Message:</b> <span id="message"></span>
</p>
</body>
</html>