function sondage(checke) {
	if (checke.checked==true) document.getElementById("sondage_add").style.display='block';
	if (checke.checked==false) document.getElementById("sondage_add").style.display='none';
}
function verif_max_choix(max,id) {
	if (choi = document.forms["sondage"].elements["sondage_choix[]"]) { 
		nb=0;
		for (i = 0; i < choi.length; i++) {
			if (choi[i].checked == true) nb++;
		}
		if (nb > max) choi[id-1].checked = false;
	}
}