function onOkClick() {
  var contactEmail_obj = document.getElementById('contactEmail');
  var contactEmail = contactEmail_obj.value;
  var contactFirstName_obj = document.getElementById('contactFirstName');
  var contactFirstName = contactFirstName_obj.value;
  var contactLastName_obj = document.getElementById('contactLastName');
  var contactLastName = contactLastName_obj.value;

  if (checkEMailField(contactEmail_obj, true, true)) {
    if(checkEmptyField(contactFirstName_obj)) {
      alert('Please, enter your first name');
    } else if(checkEmptyField(contactLastName_obj)) {
      alert('Please, enter your last name');
    } else {
      xr = new XMLHttpRequest();
      xr.open('POST', '/CustomerEmailFormGenerator', true);
      params = "operation=addContact&contactEmail=" + contactEmail + "&contactFirstName=" + contactFirstName + "&contactLastName=" + contactLastName + "&remoteIP=" + ip + "&referer=" + referer;
      xr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      xr.setRequestHeader("Content-Length", params.length);       
      xr.send(params);
      alert('Your visit is logged. Thank you!');            
      document.cookie = "PMCustomerAlreadyRegistered=1; expires=Fri, 12 Dec 2022 23:59:59 GMT; ";
      cl();
    }
  }
}