$(document).ready(function(){ // Validation $( "#j-pro" ).justFormsPro({ rules: { "newsletter[]": { required: true }, "news[]": { required: true }, email: { required: true, email: true } }, messages: { "newsletter[]": { required: "Select type of newsletter" }, "news[]": { required: "Select type of news" }, email: { required: "Add your email", email: "Incorrect email format" } } }); });