How to get login user Manager using SPServices?

var managerName;
$().SPServices({
operation: "GetUserProfileByName",
async: false,
AccountName: $().SPServices.SPGetCurrentUser(),
completefunc: function (xData, Status) {
$(xData.responseXML).find("PropertyData > Name:contains('Manager')").each(function() {
managerName = $(this).parent().find("Values").text();
alert(managerName);
});
}
});