body {
margin: 0;
padding: 0;
background-image:url("Image/PAge_Acceuil_Plots.jpg");
font: 80% verdana, arial, sans-serif;
}

dl, dt, dd, ul, li {
margin: 0;
padding: 0;
list-style-type: none;
}

#menu {
position: absolute; /* placement du menu */
top: 10;
left: 10;
z-index:100
width: 80%; /* correction pour Opera */
margin-left: 100px;	 margin-right: 50px;
}

#menu dl {   /* attribut de la barre de menu principale */
float: left;
width: 12em;
}

#menu dt { /* attribut du menu principal */
cursor: pointer;
text-align: center;
font-weight: bold;
background: #ccc;
border: 1px solid gray;
margin: 1px;
}

#menu dd {
display: none;
border: 1px solid gray; /*taille de la bordure du sous menu*/
}

/* Attributs d'affichage des sous menu */
#menu li {
text-align: center;
background: #fff;
}

#menu li a, #menu dt a {
color: #000;
text-decoration: none;
display: block;
height: 100%;
border: 0 none;
}

#menu li a:hover, #menu li a:focus, #menu dt a:hover, #menu dt a:focus { /*modification du bouton avec onmouseover */
background: #eee;
}

#site {
position: absolute;
z-index: 1;
top : 70px;
left : 10px;
color: #000;
background-color: #ddd;
padding: 5px;
border: 1px solid gray; 
}