body { 
      behavior: url(/csshover.htc); 
     } 
 
div#menu {width: 60px;}
div#menu ul {padding: 0; width: 68px; border:0px solid; margin:0px;}
div#menu li.sousmenu {background: black;}
div#menu ul.niveau1 {width : 68px}
div#menu ul.niveau2 {width : 68px}
div#menu ul li {position:relative; list-style: none; border-bottom:0px solid; left: 0px; top: 0px; }
div#menu ul ul {position: absolute; top: 0px; left:68px; display:none}
div#menu ul ul.niveau3 {position: absolute; top: 0px; left:68px; display:none}
div#menu li a {text-decoration: none;}
div#menu ul.niveau1 li.sousmenu:hover ul.niveau2, 
div#menu ul.niveau2 li.sousmenu:hover ul.niveau3 {display:block;} 

div#menu li:hover { background: #000000 } 

div#menu li.sousmenu:hover { background: #000000; }