function verifEmail(field) {
	if(field.value!=null){
		var email = field.value;
		var modele = /^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-]+)+$/;
		if (modele.test(email)){}
		else {alert("Votre E-mail est invalide !");return false;}
		return true;
	}
	return false;
}

function changeMailingValue() {
	if(document.getElementById('mailing').value==0) {
		document.getElementById('mailing').value=1;
	}
	else {
		document.getElementById('mailing').value=0;
	}
}