#skyline {
    padding: 0px; 
    background: url(../img/planisfero2.gif); 
    margin: 10px auto; 
    width: 240px; 
    position: relative; 
    height: 143px;
}

#skyline li {
    padding: 0px; 
    margin:0px;
    list-style-type: none; 
    position: absolute; 
    top: 0px;

    background:none;
    border-bottom:none;
}

#skyline li {
    display: block; 
    height: 143px;
}
#skyline a {
    display: block; 
    height: 143px;
}
#panel1 {
    left: 0px; 
    width: 87px
}
#panel2 {
    left: 87px; 
    width: 64px
}
#panel3 {
    left: 151px; 
    width: 89px
}

#panel1 a:hover {
    background: url(../img/planisfero2.gif) no-repeat 0px -143px
}
#panel2 a:hover {
    background: url(../img/planisfero2.gif) no-repeat -87px -143px
}
#panel3 a:hover {
    background: url(../img/planisfero2.gif) no-repeat -151px -143px
}