function visibilite(thingId)
{
	var i;
	var targetElement;
	for(i=1; i<3; i++){
		if(i == thingId) continue;
		targetElement = document.getElementById("sousrub" + i) ;
		targetElement.style.display = "none" ;
	}
	targetElement = document.getElementById("sousrub" + thingId) ;
	targetElement.style.display = targetElement.style.display == "none" ? "" : "none";
}