function getSubmenu(el) {
    for (var i = 0; i < el.childNodes.length; i++) {
        var node = el.childNodes[i];
        if (node.tagName && node.tagName == 'P') {
            return node;
        }
    }
}
function showSubmenu(el) {
    var node = getSubmenu(el);
    node.style.visibility = 'visible';
}
function hideSubmenu(el) {
    var node = getSubmenu(el);
    node.style.visibility = 'hidden';
}