hasAttributeNS Function Call

[Learner]

Please , Can anyone help me in finding the problem in this script or
xml document.



var temp11 = xmlDoc.documentElement;

var ns="http://www.tryit.com/fiction";

var elem = temp11.getElementsByTagName('title');

elem=elem.item(0);


if(temp11.hasAttributeNS(ns,'lang') == true)
{
return tr;
}
else
{
tr.info = "hasAttributeNS(namespaceURI,localName) failed";
tr.status = false;
return tr;
}



<?xml version="1.0" encoding="ISO-8859-1" ?>
<bookstore>
<book xmlns:d="http://www.tryit.com/fiction" category="FICTION">
<d:title d:lang="en">The Alchemist</d:title>
<d:author>Paulo Coelho</d:author>
<d:year>2005</d:year>
<drice>130.00</drice>
</book>
<book xmlns:c="http://www.tryit.com/children" category="CHILDREN">
<c:title c:lang="en">Harry Potter</c:title>
<c:author>J K. Rowling</c:author>
<c:year>2005</c:year>
<crice>429.5</crice>
</book>
</bookstore>


Thanks in Advance

Regards
Ankush