function ff_cb_action(element, action)
{
    var options = ff_getElementByName('sel').options;
    switch (action) {
        case 'click':
            if (element.checked) {
                if (options[0].selected)
                    options[1].selected = true;
            } else
                options[0].selected = true;
            break;
        default:;
    } // switch
} // ff_cb_action