$(document).ready(function() {

  $("#genericForm").validate({

    rules: {
      naam_field   : {         required: true },
      email_field   : {        required: true, email:true },
      opmerking_field : {        required: false}
    },
    //the messages shown on a validation error for various fields
    messages: {
    naam_field : {             required: "Vul uw naam in" },
    email_field : {            required: "Vul uw emailadres in",                 
    email: "Vul een geldige emailadres in" },
    opmerking_field : {        required: "Vul een vraag / opmerking in" }
    },
    success:   "valid",
    errorClass: "invalid",
    errorElement: "label",
    onfocusout: false,

    errorPlacement: function(error, element)  {
        error.insertAfter( element.parent() );

      }
    });
});