$(document).ready(function() {
  $('#form_news').validate({
    rules: {
      firstname: 'required',
      surname: 'required',
      email: {
        required: true,
        email: true
      }
    },

    messages: {
      firstname: "Please enter your first name",
      surname: "Please enter your surname",
      email: "Please enter a valid email address"
    }
  });
});