Jquery and XML

http://api.jquery.com/category/attributes/

function parseXML(xml) {
  if (window.ActiveXObject && window.GetObject) {
  var dom = new ActiveXObject('Microsoft.XMLDOM');
  dom.loadXML(xml);
  return dom;
}
  if (window.DOMParser)
  return new DOMParser().parseFromString(xml, 'text/xml');
  throw new Error('No XML parser available');
}

$(document).ready(function () {

var dom = parseXML('<Criterias><Criteria ProductTypeIDs="1,2">0</Criteria></Criterias>');

  $(dom).find('Criteria').each(function () {

  var ptids = $(this).attr("ProductTypeIDs");
  var innerText = $(this).text();
  $(this).text('1');
  $(this).attr("ProductTypeIDs", "1,4");

});

$(dom).find('Criteria').each(function () {

  var ptids = $(this).attr("ProductTypeIDs");
  var innerText = $(this).text();

});

});