$(document).ready(function() {
      $("#contact_form").validate({
        rules: {
          name: "required",// simple rule, converted to {required:true}
          email: {// compound rule
          required: true,
          email: true
        },
        url: {
          url: true
        },
        comment: {
          required: true
        }
        },
        messages: {
          comment: "Envie sua consulta."
        }
      });
    });