xml parse

xml parse

im using this tutorial
but it only seems to work in FF,  chrome and IE gives errors
does anyone know why this is?

  2. $(document).ready(function()
  3. {
  4.   $.ajax({
  5.     type: "GET",
  6.     url: "jquery_xml.xml",
  7.     dataType: "xml",
  8.     success: parseXml,
  9. error: err
  10. });
  11. });
  12. function err(xhr, reason, ex) 
  13. { 
  14.   $('#output').append(reason);
  15. }

  17. function parseXml(xml)
  18. {
  19.   $(xml).find("Tutorial").each(function()
  20.   {
  21.     $("#output").append($(this).attr("author") + "<br />");
  22.   });
  23. }