#side-a
{
background: transparent url(../pic/home_top.png) no-repeat;
}

/* Alerte pano */
#alert
{
position: absolute;
width: 291px;
height: 340px;
top: 180px;
left: 320px;
background: transparent url(../pic/mode_emploi.png) no-repeat;
z-index: 10;
visibility: hidden;
}