ul#imgRO3{
margin-left:-20px;
background-image: url(../images/docback.jpg);
background-repeat: no-repeat;
background-position: top left;
margin-bottom:30px;
}

ul#imgRO3 li{
list-style:none;
}

ul#imgRO3 li a{
display:block;
background-position:top left;
background-repeat:no-repeat;
width:650px;
height:100px;
}

ul#imgRO3 li.dipinti a{
background-image:url(../images/doc1.png);
}

ul#imgRO3 li.carta a{
background-image:url(../images/doc2.png);
}

ul#imgRO3 li.pala a{
background-image:url(../images/doc3.png);
}

ul#imgRO3 li a:hover{
background-position:top right;
}