.roll {
	display: block;
	position: absolute;
	border:none;
	text-decoration:none;
}
a.anim {
	position:absolute;
   	display: block;
	color: #ffffff;     
   	width: 532px;
   	height: 310px;
   	background-image: url(../IMAGES/ahm_intro_site_2011_bleu.gif);
	background-color:#000000;
   	background-repeat: no-repeat;
	text-decoration:none;
}
	 
a.anim:hover {
   	background-image: url(../IMAGES/ahm_intro_site_2011_bleu_inverse.gif);
	background-color:#000000;
	text-decoration:none;
}