var _menu = document.getElementById("liumenu");
var dlItems = _menu.getElementsByTagName('dl');
var dtItems = _menu.getElementsByTagName('dt');
function closeOtherDL(obj) {
    for (var i = 0; i < dlItems.length; i++) {
        if (dlItems[i] != obj) {
            dlItems[i].className = 'itemList_hidden';
        }
    }
}
for (var i = 0; i < dtItems.length; i++) {
    dtItems[i].onclick = function() {
        var currentDL = this.parentNode;
        closeOtherDL(currentDL);
        if (currentDL.className == 'itemList_show') {
            currentDL.className = 'itemList_hidden';
        } else {
            currentDL.className = 'itemList_show';
        }
    }
}