var encours="";
function AffLayer(p) {
	var nomlayer=p
	if (document.all) {
		if (encours!="") {document.all[encours].style.visibility="hidden";}
		encours=nomlayer;
		if (nomlayer!="") {document.all[encours].style.visibility="visible";}
	}
	if (document.layers) {
	  	if (encours!="") {document.layers[encours].visibility="hide";}
		encours=nomlayer;
		if (nomlayer!="") {document.layers[encours].visibility="show";}
	}
}