[PHP-JS] où est l'erreur dans ce code php

bonjour

j'ai ce message d'erreur qui s'affiche quand j'enregistre les modifications du compte
Citation:
Warning: Cannot modify header information - headers already sent by (output started at d:\wamp\www\orientalartdeco\php\modification.php:3) in d:wamp\www\orientalartdeco\php\modification.php on line 56
si quelqu'un peut m'aider car je bloque merci a vous

voici le code :
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<?php session_start(); ?>

<?php require_once('../Connections/orientalartdeco.php'); ?>
<?php
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  $theValue = (!get_magic_quotes_gpc()) ? addslashes($theValue) : $theValue;

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}

$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}

if ((isset($_POST["MM_update"])) && ($_POST["MM_update"] == "form1")) {
  $updateSQL = sprintf("UPDATE table_compte_client SET Nom=%s, Prénom=%s, Adresse=%s, Code_postal=%s, Ville=%s, Téléphone=%s, Email=%s, Login=%s, `Mot _de_ passe`=%s WHERE Idclient=%s",
                       GetSQLValueString($_POST['Nom'], "text"),
                       GetSQLValueString($_POST['Prénom'], "text"),
                       GetSQLValueString($_POST['Adresse'], "text"),
                       GetSQLValueString($_POST['Code_postal'], "int"),
                       GetSQLValueString($_POST['Ville'], "text"),
                       GetSQLValueString($_POST['Téléphone'], "int"),
                       GetSQLValueString($_POST['Email'], "text"),
                       GetSQLValueString($_POST['Login'], "text"),
                       GetSQLValueString($_POST['Mot__de__passe'], "text"),
                       GetSQLValueString($_POST['Idclient'], "int"));

  mysql_select_db($database_orientalartdeco, $orientalartdeco);
  $Result1 = mysql_query($updateSQL, $orientalartdeco) or die(mysql_error());

  $updateGoTo = "index.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $updateGoTo .= (strpos($updateGoTo, '?')) ? "&" : "?";
    $updateGoTo .= $_SERVER['QUERY_STRING'];
  }
  header(sprintf("Location: %s", $updateGoTo));      erreur sur cette ligne apparemment  
}

$colname_Modification = "-1";
if (isset($_SESSION['MM_Username'])) {
  $colname_Modification = (get_magic_quotes_gpc()) ? $_SESSION['MM_Username'] : addslashes($_SESSION['MM_Username']);
}
mysql_select_db($database_orientalartdeco, $orientalartdeco);
$query_Modification = sprintf("SELECT * FROM table_compte_client WHERE Email = '%s'", $colname_Modification);
$Modification = mysql_query($query_Modification, $orientalartdeco) or die(mysql_error());
$row_Modification = mysql_fetch_assoc($Modification);
$totalRows_Modification = mysql_num_rows($Modification);
?>
<html>

<head>
<title>www.orientalartdeco.com Modification  </title>
<meta name="generator" content="Namo WebEditor v5.0(Trial)" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"></head>

<body bgcolor="white" text="black" alink="red">
<p align="center"><img src="logo.gif" width="962" height="57" border="0" /></p>
<div class="Style12" id="Layer33">
  <div align="left" class="Style13"><a href="signup.php">D&eacute;ja client</a></div>
</div>
<p align="right"><span style="font-size:16pt;"><b><i><span class="Style20"></span><font color="yellow">&nbsp;&nbsp;&nbsp;</font></i></b></span><span style="font-size:16pt;"><b><i><font color="yellow"> 
&nbsp;&nbsp;</font></i></b></span><span style="font-size:16pt;"><b><i><font color="yellow">&nbsp;&nbsp; </font></i></b></span><a href="procheorientdeco.htm"></a> <b><i><font color="yellow">&nbsp;&nbsp;</font></i></b></p>
<p>&nbsp;</p>

<div class="Style10" id="Layer32">
  <div align="left"><a href="create.php" class="Style13">inscription en ligne</a></div>
</div>
<p align="center"><b><i><span style="font-size:48pt;">&nbsp;</span><span style="font-size:16pt;">&nbsp;&nbsp;</span></i></b></p>
<DIV class=Style5 id=Layer1>
  <P align=center class="Style15 Style20">Modifier vos donn&eacute;es personnelles </P>
</DIV>
<div class="Style21" id="Layer44">
  <div align="center">Copyright 2007 tous droits r&eacute;serv&eacute;s www.orientalartdeco.com </div>
</div>
<div id="Layer47">
  <form method="post" name="form1" action="<?php echo $editFormAction; ?>">
    <table align="center">
      <tr valign="baseline">
        <td nowrap align="right">Nom:</td>
        <td><input name="Nom" type="text" value="<?php echo $row_Modification['Nom']; ?>" size="32" maxlength="50"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Prénom:</td>
        <td><input name="Pr&eacute;nom" type="text" id="Pr&eacute;nom" value="<?php echo $row_Modification['Prénom']; ?>" size="32" maxlength="50"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Adresse:</td>
        <td><input name="Adresse" type="text" value="<?php echo $row_Modification['Adresse']; ?>" size="32" maxlength="100"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Code_postal:</td>
        <td><input name="Code_postal" type="text" value="<?php echo $row_Modification['Code_postal']; ?>" size="32" maxlength="5"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Ville:</td>
        <td><input name="Ville" type="text" value="<?php echo $row_Modification['Ville']; ?>" size="32" maxlength="40"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Téléphone:</td>
        <td><input name="T&eacute;l&eacute;phone" type="text" id="T&eacute;l&eacute;phone" value="<?php echo $row_Modification['Téléphone']; ?>" size="32" maxlength="10"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Email:</td>
        <td><input name="Email" type="text" value="<?php echo $row_Modification['Email']; ?>" size="32" maxlength="50"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Login:</td>
        <td><input name="Login" type="text" value="<?php echo $row_Modification['Login']; ?>" size="32" maxlength="20"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">Mot _de_ passe:</td>
        <td><input name="Mot__de__passe" type="text" value="<?php echo $row_Modification['Mot _de_ passe']; ?>" size="32" maxlength="20"></td>
      </tr>
      <tr valign="baseline">
        <td nowrap align="right">&nbsp;</td>
        <td><input type="submit" value="Mettre à jour l'enregistrement"></td>
      </tr>
    </table>
    <input type="hidden" name="Idclient" value="<?php echo $row_Modification['Idclient']; ?>">
    <input type="hidden" name="MM_update" value="form1">
    <input type="hidden" name="Idclient" value="<?php echo $row_Modification['Idclient']; ?>">
  </form>
  <p>&nbsp;</p>
</div>
<p>&nbsp;</p>
<div class="Style10" id="Layer34">
  <div align="right"><a href="mode_de_paiement.php">Modes de paiements </a></div>
</div>
<div class="Style10" id="Layer35">
  <div align="right"><a href="aide en ligne.php">Aide en ligne </a></div>
</div>
<div class="Style10" id="Layer36"><a href="SERVICES.php">Plans de travail sur mesure </a></div>
<div class="Style10" id="Layer37">
  <div align="right"><a href="securite.php">S&eacute;curit&eacute;</a></div>
</div>
<div class="Style10" id="Layer38">
  <div align="right"><a href="livraison.php">Livraison</a></div>
</div>
<div class="Style10" id="Layer39"><a href="CONDITIONS_GENERALES_DE_VENTE.php">Conditions g&eacute;n&eacute;rales de ventes</a> </div>
<div class="Style10" id="Layer40">
  <div align="right"><a href="contact.php">Contactez nous </a></div>
</div>
<div class="Style10" id="Layer41">
  <div align="right"><a href="espace_client.php">Mon compte</a> </div>
</div>
<div class="Style10" id="Layer42">
  <div align="right"><a href="../ACCOUNT/panier.php">Mon panier </a></div>
</div>
<div class="Style10" id="Layer43">
  <div align="right"><a href="ma commande.php">Ma commande </a></div>
</div>
<div class="Style14" id="Layer8">
  <div align="left" class="Style12">Pour modifier vos informations personnelles sur orientalartdeco compl&eacute;tez simplement le formulaire ci-joint. </div>
</div>
<p>&nbsp;</p>

<p>&nbsp;</p>
</body>

</html>
<?php
mysql_free_result($Modification);
?>