.CC {background-image:url(../images/bg.gif); background-repeat:no-repeat; background-position: top center;}

.FF {background-image:url(../images/bg_feuille.gif); background-repeat:no-repeat; background-position: top center;}
                                                     
.PP { background-image:url(../images/bg_page.gif);  background-repeat:no-repeat; background-position: top center;}