var accItem = document.getElementsByClassName('accordionItem'); var accHD = document.getElementsByClassName('accordionItemHeading'); for (i = 0; i < accHD.length; i++) { accHD[i].addEventListener('click', toggleItem, false); } function toggleItem() { var itemClass = this.parentNode.className; for (i = 0; i < accItem.length; i++) { accItem[i].className = 'accordionItem close'; } if (itemClass == 'accordionItem close') { this.parentNode.className = 'accordionItem open'; } }