//on liste les mails
$requeteMail=mysql_query("SELECT email FROM UTILISATEUR WHERE Niveau=1 OR Niveau=9");

while ($donnees = mysql_fetch_array($requeteMail) )
{
if($Mail!=""){
$Mail = $Mail . ";";
$Mail = $Mail . $donnees['email'];
}
else{
$Mail=$donnees['email'];
}
}
echo "$Mail<br>";
echo "<a href=\"mailto:$Mail?subject=Bibliotheque\"> Contactez-nous</a>";