document.addEventListener('DOMContentLoaded', function() { var hcpButton = document.getElementById('welcome-close'); hcpButton.addEventListener('click', function () { sessionStorage.setItem('hcp-confirmed', true); document.getElementById('welcome-popup').classList.add('hidden'); }); var hcp = sessionStorage.getItem('hcp-confirmed'); if (null === hcp) { document.getElementById('welcome-popup').classList.remove('hidden'); } });