Niente ora ho corretto il codice con:

codice:
#uno {
width:auto;
float:left;
}

#uno ul{
list-style:none;
margin-left:0px;
padding:0px;
border:none;
float:block;
}

#uno ul li{
width:101px;
heigh:66px;
border:none;
display:inline;
float:left;
margin-right: 11px;
}

a#1:link{
text-decoration: none;
background-image: url(2mt.png);
display:block;
width: 100px;
height: 66px;
}


a#1:visited{
text-decoration: none;
background-image: url(2mt.png);
display:block;
width: 100px;
height: 66px;
}

a#1:hover{
text-decoration: none;
background-image: url(prezz1.png);
display:block;
width: 100px;
height: 66px;
}




a#2:link{
text-decoration: none;
background-image: url(10mt.png);
display:block;
width: 100px;
height: 66px;
}

a#2:visited{
text-decoration: none;
background-image: url(10mt.png);
display:block;
width: 100px;
height: 66px;
}

a#2:hover{
text-decoration: none;
background-image: url(prezz2.png);
display:block;
width: 100px;
height: 66px;
}




a#3:link{
text-decoration: none;
background-image: url(20mt.png);
display:block;
width: 100px;
height: 66px;
}

a#3:visited{
text-decoration: none;
background-image: url(20mt.png);
display:block;
width: 100px;
height: 66px;
}

a#3:hover{
text-decoration: none;
background-image: url(prezz3.png);
display:block;
width: 100px;
height: 66px;
}




a#4:link{
text-decoration: none;
background-image: url(50mt.png);
display:block;
width: 100px;
height: 66px;
}

a#4:visited{
text-decoration: none;
background-image: url(50mt.png);
display:block;
width: 100px;
height: 66px;
}


a#4:hover{
text-decoration: none;
background-image: url(prezz4.png);
display:block;
width: 100px;
height: 66px;
}




a#5:link{
text-decoration: none;
background-image: url(100mt.png);
display:block;
width: 100px;
height: 66px;
}

a#5:visited{
text-decoration: none;
background-image: url(100mt.png);
display:block;
width: 100px;
height: 66px;
}

a#5:hover{
text-decoration: none;
background-image: url(prezz5.png);
display:block;
width: 100px;
height: 66px;
}
Ma niente ilrisultato non è cambiato, con firefox vedo solo dei trattini :-(