jquery ajax post

gistfile1.js

  $j.ajax({
    type: "POST",
    url: "/some_controller/some_action",
    data: {
      first_name: $j("#first_name").val(),
      last_name: $j("#last_name").val(),
    },
    success: function(data, textStatus) {
      // do what you like
    },
    error: function(result) { defaultAjaxErrorHandler(result, true); }
  });