function switch_tabs(tab) { var tabs = document.getElementById('tabs').getElementsByTagName('li').length; //switch off all tabs and content for (i=0; i < tabs; i++) { document.getElementById('tab'+(i+1)).className = ''; document.getElementById('tab'+(i+1)+'_content').style.display = 'none'; } //switch on the selected tab and content document.getElementById(tab).className = 'tqd-selected'; document.getElementById(tab+'_content').style.display = 'block'; }