function toggleItem(el) {
    var items = document.getElementById('main-menu').getElementsByTagName('a');
    for (var i = 0; i < items.length; i++) {
        var a = items[i];
        if (a.className.indexOf('m_about') != -1)
            a.id = '';
    }

    el.id = 'm_active';

    var submenus = document.getElementById('main-menu').getElementsByTagName('ul');
    for (var i = 0; i < submenus.length; i++) {
        submenus[i].style['display'] = 'none';
    }

    var current = el.parentNode.getElementsByTagName('ul');
    if (current[0]) {
        var ul = current[0];
        ul.style['display'] = 'block';
//        ul.style['display'] = (ul.style['display'] == 'none') ? 'block' : 'none';
    }
    return false;
}