$(function() {
  var v = $("#form_contact").jcheck({language: 'pt-br'});
  v.validates("name","ddd","phone", {presence: true});
  v.validates("email", {format: {"with": "email", message: "por favor, digite um email válido"}});
  v.validates("message", {length: {minimum: 20, maximum: 255}});
});