#button {
padding: 0;
}

#button li {
display: inline;
}

#button li a {
font-family: Arial;
font-size:11px;
text-decoration: none;
float:left;
padding: 7px;
color: #555;
}

#button li a:hover {
background-image: url(flecha.gif);
background-repeat:no-repeat;
background-position: center;
background-position:top;
}

#button li a:active {
background-image: url(flecha.gif);
background-repeat:no-repeat;
background-position: center;
background-position:top;
}