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IE8 appendChild to XML issue: Type Mismatch
// How i get xml
$.ajax({
  url: production_get,
  dataType: "xml",
  success: function(data) {
      input_xml=data;
  }
});

// how i try to append a new node to

new_user_node = document.createElement('user');
new_user_node.setAttribute('id',new_user_id);
new_user_node.setAttribute('label',new_user_label);

response=$(input_xml)[0].getElementsByTagName("response")[0];
response.appendChild(new_user_node); // <- type mismatch

<response>
    <user id="123" label="John" />
</response>

/* First create xml doc*/
var xmlDoc=$.parseXML(input_xml);

/*Create jQuery object of xml doc*/
var $xml= $( xmlDoc);

/*Now append*/
$xml.append( new_user_node);