<script>

xmlDoc=loadXMLDoc("books.xml");

newNode=xmlDoc.createElement("book");

x=xmlDoc.documentElement;

y=xmlDoc.getElementsByTagName("book");

document.write("Book elements before: " + y.length);

document.write("<br>");

x.insertBefore(newNode,y[3]);

y=xmlDoc.getElementsByTagName("book");

document.write("Book elements after: " + y.length);

</script>

​