function changeClass(element, className) {
    if (element.className.search(className) == -1) {
        element.className += ' ' + className;
    }
    else {
        element.className = element.className.replace(className, '');
    }
}

function changeState(element) {
    // if (element.getElementsByTagName('ul').length == 0) changeClass(element, 'single');
    //else 
    changeClass(element, 'opened');
}

function changeStateSG(element) {
    changeClass(element, 'openedSG');    
}