function flipflop(numlayer) {
//gestion des cas possibles
closealllayer();
switch (numlayer)	 {
	case 1:
		SSMCand.style.visibility='visible';
		break;
	case 2:
		SSMEntr.style.visibility='visible';
		break;
	case 3:
		SSMAnn.style.visibility='visible';
		break;
	case 4:
		SSMAnnonc.style.visibility='visible';
		break;
	case 5:
		SSMCult.style.visibility='visible';
		break;
	case 6:
		SSMInfos.style.visibility='visible';
		break;
}
}
function closealllayer() {
SSMCand.style.visibility='hidden';
SSMEntr.style.visibility='hidden';
SSMAnn.style.visibility='hidden';
SSMAnnonc.style.visibility='hidden';
SSMCult.style.visibility='hidden';
SSMInfos.style.visibility='hidden';
}