#menu ul {
list-style-type: none; 
margin: 0;
padding: 0; 
font: bold 10px verdana, helvetica, sans-serif;
}

#menu a {
display: block;
width : 130px;
padding: 4px 0 4px 30px;
color: #000;
text-decoration: none;
background: transparent url('../img/menu/nivel_on.jpg') no-repeat; 
}

#menu a:hover { 
background: transparent url('../img/menu/nivel_hover.jpg') no-repeat; 
padding: 4px 0 4px 30px;
color:#000; 
}