.visuel {
	background: url(../images/bando_insolite3.jpg) no-repeat fixed left top;
}
.maisons {
	background: url(../images/bando_maisons3_appl.jpg) no-repeat fixed left top;
}
.messages {
	background: url(../images/bando_messages3.jpg) no-repeat fixed left top;
}
.bossu {
	background: url(../images/bando_bossu4.jpg) no-repeat fixed left top;
}
.bibliographie {
	background: url(../images/bando_biblio.jpg) no-repeat fixed left top;
}