var randomNumber=Math.floor(Math.random()*3);
	var prefixea="<img src='images/index_rdma_00";
	var prefixeb="<img src='images/index_rdmb_00";
	var sufixea=".jpg' width='199' height='89' alt='Ateliers de la colline'></td>";
	var sufixeb=".jpg' width='780' height='367' alt='Ateliers de la colline'></td>";