#conteneur {
margin: 0 auto;
}

#entete {
}

#leftside {
float: left;
width: 200px;
}

#rightside {
float: right;
width: 200px;
}

#middle {
position: relative;
margin-left: 200px;
margin-right: 200px;
}

#footer {
font-size: 8px;
clear: both;
}