ul, li { /* using a list for menu */
list-style-type: none;  /* cleaning up the list */
margin:0;
padding:0;
}

ul {
position: normal; /* positionning for IE5 et IE5.5 */
left: 20%;
top: 50px;
background: transparent url(../img/nav.jpg) top left no-repeat; /* general background for the menu */
height: 270px;
width: 300px;
text-align: center;
}

li {
display: inline; /* correction for IE5 et IE5.5 */
}

li a { /* buttons dimensions and definition */
display: block;  /* block for <a> to give it its dimensions */
height: 30px;
width: 300px;
line-height: 30px;  /* height of line to avoind paddings */
color: #000000;
font-size: 18px;
font-family: Palatino Linotype, Book Antiqua, Palatino, serif;
font-style: italic;
text-decoration: none;
}

li a:hover {
color: #DBC500;
background: transparent url(../img/nav.jpg) top left no-repeat;
}

a#menu1:hover {
background-position: 0% -270px; /* move of background for each button */
}

a#menu2:hover {
background-position: 0% -300px;
}

a#menu3:hover {
background-position: 0% -330px;
}

a#menu4:hover {
background-position: 0% -360px;
}

a#menu5:hover {
background-position: 0% -390px;
}

a#menu6:hover {
background-position: 0% -420px;
}

a#menu7:hover {
background-position: 0% -450px;
}

a#menu8:hover {
background-position: 0% -480px;
}