function cache (id) {
	document.getElementById(id).style.visibility = "hidden";
}

function montre (id) {
	for (i=1; i<5; i++) {
		cache ('case'+i);
	}
	document.getElementById(id).style.visibility = "visible";
}

function chg_img(id_img,chemin)
{
	document.getElementById(id_img).src = chemin;
}