<html>
<head>
<script src="/demo/loadxmldoc.js">
</script>
</head>
<body>
<script>
xmlDoc=loadXMLDoc("books.xml");
x=xmlDoc.getElementsByTagName("book")[0]
y=x.getAttributeNode("category");
y.nodeValue="food";
document.write(y.nodeValue);
</script>
</body>
</html>