function foldertab(index, name, cookieName)
{	
	var tabBase = 'ftab' + index + '_';
	var paneBase = 'fpane' + index + '_';
	
	// hide all tabs
	var i = 0;
	var tab;
	while (tab = document.getElementById(tabBase + i)) {
		_bsDom.setDisplay(_bsDom.get(paneBase + i), 0);
		tab.className = 'ftab off';
		i++;
	}

	_bsDom.setDisplay(_bsDom.get(paneBase + name), 1);
	tab = document.getElementById(tabBase + name);
	tab.className = 'ftab on a' + index;
	
	// set the cookie
	if (cookieName)
		document.cookie = cookieName + '=' + name;
}