html = '<iframe width="100%" height="300" src="' + tinyMCEPopup.editor.baseURI.toAbsolute(tinyMCEPopup.getParam('docs_url')) + '"></iframe>';
document.getElementById('iframecontainer').innerHTML = html;
document.getElementById('help_tab').style.display = 'block';
+ document.getElementById('help_tab').setAttribute("aria-hidden", "false");
}
}