<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;
});