function verif(email) {
	var arobase = email.indexOf("@")
	var point = email.lastIndexOf(".")
	if((arobase < 2)||(point + 2 > email.length)||(point < arobase+2)) { alert('Cet e-mail n\'est pas valide !');
	document.getElementById("erreur_mail").style.visibility="visible";
	return false }
	else { document.newsletter.submit();return true }
}