function verif_nl() {
	var err = "";
	var email = document.getElementById("nl_email").value;
	if(email != "") {
		if((email.indexOf("@") == -1) || (email.indexOf("@") == 0) || (email.indexOf("@") != email.lastIndexOf("@")) || (email.indexOf(".") == email.indexOf("@")-1) || (email.indexOf(".") == email.indexOf("@") +1) || (email.indexOf("@") == email.length -1) || (email.indexOf (".") == -1) || (email.lastIndexOf (".") == email.length -1)) err += '- E-mail : non valide\n';
	} else err += '- E-mail : obligatoire\n';
	if(err != "") alert("renseignementsinexacts :\n"+err);
	document.nl_result = (err == "");
}