How to add XML Parser to manipulate xml in spidermonkey

How to add XML Parser to manipulate xml in spidermonkey 

I want to parse xml like this:
  <?xml version="1.0" encoding="UTF-8"?>
   <quote xmlns="http://www.example.org">
    <ticker>F</ticker>
    <name>Ford Motor Company</name>
    <change>1.00</change>
    <last>30.00</last>
   </quote>


and handle it like document object in a browser as following 

var price= quote.documentElement.getElementsByTagNameNS("http://www.example.org", "last").item(0).firstChild.data;