.top {text-align:left; height:525px;
background-color: #000000;
}
/* IMAGES SURVOL */
#survol a {
display:block;
width:960px; 
height:525px;
top center no-repeat;
background: url(../images/ban.jpg); 
} 
#survol a:hover{
display:block;
width:960px; 
height:525px;
top center no-repeat;
background: url(../images/ban2.jpg);
cursor:default; 
}