function closeBox() {
    idx = document.getElementById('last_opened').value;
    box = document.getElementById(idx);
    if (box) {
        box.style.display = 'none';
    }
}

function openBox(idx) {
    closeBox();
    box = document.getElementById(idx);
    if (box) {
        box.style.display = 'block';
        document.getElementById('last_opened').value = idx;
    }
}

function replaceMenu(idx) {
    document.getElementById('seasons').style.display = 'none';
    document.getElementById(idx).style.display = 'block';
    document.getElementById('notice').style.display = 'block';
}