function itemA(elem) {
    if (elem.parentNode.className.slice(-2)!='-a')
        elem.parentNode.className = elem.parentNode.className + '-h';
}

function itemX(elem) {
    if (elem.parentNode.className.slice(-2)!='-a')
        elem.parentNode.className = elem.parentNode.className.slice(0, -2);
}

function itemC(elem) {
    if (elem.parentNode.className.slice(-2)!='-a')
        elem.parentNode.className = elem.parentNode.className.slice(0, -2) + '-c';
}

function itemU(elem) {
    if (elem.parentNode.className.slice(-2)!='-a')
        elem.parentNode.className = elem.parentNode.className.slice(0, -2) + '-h';
}