$(document).ready(function() {
          function generateUUID() {
              return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
                  var r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
                  return v.toString(16);
              });
          }

          if (!localStorage.getItem('visitorId')) {
              localStorage.setItem('visitorId', generateUUID());
          }

          $('.modal-close').on('click', function() {
              $(this).closest('.modal').hide();
          });
      });