Erreur en php

<form method="post">
<p>
<?php
  echo '<select size=1 name="proprietaire">'."\n"; 
  echo '<option value="-1">proprio<option>'."\n"; 
   
  // Récupération des informations triées par ordre alphabétique 
  $sql = "SELECT id_infos,proprietaire FROM infos ORDER BY id_infos"; 
  $ReqLog = mysql_query($sql, $connexion); 
   
	while ($resultat = mysql_fetch_row($ReqLog)) 
	{ 
		echo '<option value="'.$resultat[1].'">'.$resultat[1]; 
		echo '</option>'."\n"; 
	} 
?>
	<input type="submit" name="btsave" value="OK" />
</p>
</form>
<?php
	if(isset($_POST['btsave']))
		{
		if(isset($_POST['proprietaire']))
			{
			$where=$_POST['proprietaire'];
			echo 'choix: '.$where;
			$aze=mysql_query('SELECT nom,proprietaire FROM infos WHERE proprietaire='.$where);
			while($resultat=mysql_fetch_array($aze))
				echo $resultat['proprietaire'].'</br>';
			}
		}
 mysql_close($connexion);?>