Erreur php correction

Bonjour,
j'ai une page blanche

accueil.php
<form method="POST" action="modificationsearch.php">

<td colspan=2>Nom</td>

<input type="text" name="nom" size="20">
<input type="submit" value="nom">
</form>

modificationsearch.php
<?php
//connection au serveur:
$cnx = mysql_connect( "localhost", "root", "" ) ;

//sélection de la base de données:
$db = mysql_select_db( "fuaj" ) ;

$nom = mysql_real_escape_string($_POST['nom'],ENT_QUOTES);

$query = "SELECT * FROM spip_fuaj_adherents WHERE nom='".$nom."'";

$result = mysql_query($query) or die(mysql_error());

$row = mysql_fetch_array($result);

echo $row['nom'].' '.$row['prenom'];
?>