<form target="_blank" action="www.websiteipostto.com" method="POST">

// You bind event handler to the form submit
$('form#name').submit(function () {
  $.ajax({
    type: "POST",
    url: "www.websiteipostto.com",
    success: function (data) {
      $.parseXML(data)
      //There you perform you action on the XML-format data.
    }
  });

  //Cancel the default redirecting action

  return false;

});