function montrer(quoi) {
	var aChanger = document.getElementById(quoi);
	aChanger.style.visibility = "visible";
	aChanger.style.display = "block";
	var quoiImg = quoi + "_img";
	document.getElementById(quoiImg).innerHTML = "<img src='moins.gif' alt='Moins' onclick='cacher(\"" + quoi + "\");' />";
}

function cacher(quoi) {
	var aChanger = document.getElementById(quoi);
	aChanger.style.visibility = "hidden";
	aChanger.style.display = "none";
	var quoiImg = quoi + "_img";
	document.getElementById(quoiImg).innerHTML = "<img src='plus.gif' alt='Plus' onclick='montrer(\"" + quoi + "\");' />";
}