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function switchTab(activeId) { var tabs = [‘home’, ‘messages’, ‘groups’, ‘settings’]; for (var i = 0; i < tabs.length; i++) { var element = document.getElementById(tabs[i]); if (element) { element.style.display = tabs[i] === activeId ? 'block' : 'none'; } } } document.addEventListener('DOMContentLoaded', function() { var navItems = document.querySelectorAll('[data-tab]'); for (var i = 0; i < navItems.length; i++) { navItems[i].addEventListener('click', function() { switchTab(this.getAttribute('data-tab')); }); } });