Le code php d'insertion ne marche pas

if(isset($_POST['Ajout'])){ 

$requete= "INSERT INTO locationch SET  IdClient='".$_POST['IdClient']."', IdEmpl='".$_POST['IdEmpl']."', IdChambre='".$_POST['IdChambre']."', datdebLoc='".$_POST['datdebLoc']."', datfinLoc='".$_POST['datfinLoc']."', montAvaLoc='".$_POST['montAvaLoc']."', lieuProv='".$_POST['lieuProv']."', PosteEntr='".$_POST['PosteEntr']."', motifSjr='".$_POST['motifSjr']."'"; 

$resultat = mysql_query($requete); 

<?php include("header.php");
include("calendrier.php");?>

<?php

require_once("connectionMYSQL.inc.php");

if(isset($_POST['Ajout'])){

$requete= "INSERT INTO locationch SET  IdClient='".$_POST['IdClient']."', IdEmpl='".$_POST['IdEmpl']."', IdChambre='".$_POST['IdChambre']."', datdebLoc='".$_POST['datdebLoc']."', datfinLoc='".$_POST['datfinLoc']."', montAvaLoc='".$_POST['montAvaLoc']."', lieuProv='".$_POST['lieuProv']."', PosteEntr='".$_POST['PosteEntr']."', motifSjr='".$_POST['motifSjr']."'"; 

$resultat = mysql_query($requete);
}
if (isset($_GET['IdClient'])){
 $requete4= "SELECT * FROM client WHERE IdClient = '".$_GET['IdClient']."' ";
 $resultat4 = mysql_query($requete4);
 $client = mysql_fetch_array($resultat4);
 }
 $requete2= "SELECT * FROM employe ";
 $resultat2 = mysql_query($requete2);

 $requete3= "SELECT * FROM chambre ";
 $resultat3 = mysql_query($requete3);

$message=" Choisissez un client";
?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr" >
	<head>
	<title>Gestion Restaurant de Mombassa Hotel</title>
	</head>
	<body>
	<br></br>
	<h2 align=center> ENREGISTREMENT DES LOCATIONS DE CHAMBRES</h2>
	<FIELDSET width=300 STYLE="background: #bbb;" >
	<legend align= center> Nouvelle Location</legend>
	<table border = "4" cellpadding=10>
	<form id="form1" name= "form1" action="LocationInsert.php" method="POST">
	<table align=center border = "0" cellpadding=5>
	<tr>
	<td>Nom du Client:</td>
	<td><input type="text" name="IdClient" value="<?php if(($_GET['IdClient'])) echo $client['IdClient'].$client['nomCl'].$client['prenom'];?>"/> <?php if(($_GET['IdClient'])) echo "<a href=\"ClienLocSearch..php\"> <img src=\"images/add.gif\" >"; else { echo $message." " ;?> <a href="ClienLocSearch.php"> 
	<img src="images/add.gif" alt = "supprimer" border = '0px'> <?php }?></td>
	</tr>
	
	<tr>
	<td>Nom de l'employe:</td>
	<td><select name="IdEmpl" id="IdEmpl">
	<?php while($employe= mysql_fetch_array($resultat2)) { ?>
	<option value="<?php echo $employe['IdEmpl'];?>" > <?php echo $employe['nomEmpl'];?> </option>
	<?php } ?>
	</select >
	</tr>
	
	<tr>
	<td>Numero Chambre:</td>
	<td><select name="IdChambre" id="IdChambre">
	<?php while($chambre= mysql_fetch_array($resultat3)) { ?>
	<option value="<?php echo $chambre['IdChambre'];?>" > <?php echo $chambre['IdChambre'];?> </option>
	<?php } ?>
	</select >
	</tr>
	
	<tr>
	<td> Date Debut:</td>
	<td> <input type="text" name="datdebLoc" class="calendrier">
	</tr>

	<tr>
	<td> Date Fin:</td>
	<td> <input type="text" name="datfinLoc" class="calendrier"> 
	</tr>
	<tr>
	<td>Montant Avancé:</td>
	<td><input type="text" name="montAvaLoc"/></td>
	</tr>
	<tr>
	<td>Lieu de Provenance:</td>
	<td><input type="text" name="LieuProv"/></td>
	</tr>
	<tr>
	<td>Poste d'Entrée:</td>
	<td><input type="text" name="PosteEntr"/></td>
	</tr>
	<tr>
	<td>Motif de Sejour:</td>
	<td>Affaire<input type="radio" name="motifSjr" value="Affaire"/>Tourisme<input type="radio" name="motifSjr" value="Tourisme" />Autres<input type="radio" name="motifSjr" value="Autres"</td>
	</tr>
	
	<tr>
	<td align="center" colspan="4">
	<input type="submit" name="Ajout" value="Envoyer">
	<input type="reset" name="Annuler" value="Annuler">
	</td>
	</tr>
	</table>
    </form>
	</fieldset>
	
<?php include("footer.php")?>
	</body>
	</html>