mysql_query("INSERT INTO message (id, nom, prenom, email, message) VALUES ('', $nom, $prenom, $email, $message)") or die(mysql_error());
mysql_query("INSERT INTO message ('id', 'nom', 'prenom', 'email', 'message') VALUES ('', $nom, $prenom, $email, $message)");
<html>
<head>
<link type="image/x-icon" href="favicon.ico" rel="icon" />
</head>