function Envoi_mail() {
	if(document.mail.nom.value != "" && document.mail.telephone.value != "" && document.mail.mail.value != "" && document.mail.message.value != "") {
		
		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
		var address = document.mail.mail.value;
		if(reg.test(address) == false) {
			alert('Adresse Mail non valide');
			return false;
		}
		
		document.mail.submit();
	}
	else {
		alert("Veuillez renseigner tous les champs obligatoires !");	
	}
}