ul {
    list-style: url(../design/but1.gif);
    padding-left:32px;
}

ul li:hover { list-style: url(../design/but2.gif); }

ul li ul { display:none; }

ul li ul.s { display:block; }

ul li ul li ul { list-style:none !important; padding:0; margin-left:-54px;}

ul li ul li ul li:hover { list-style:none !important; }