Masque de saisie de champ jquery

Bjr, ci-joint mon code

je declare les deux fichiers jquer.js et jQuery.maskedinput.js
après le <body> je declare mon script avec le masque de saisie sur le champ "durprevh"

mais rien ne fonctionne pourtant l id du champ et le même ?

merci
Code:
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<link rel="stylesheet" type="text/css" href="../style.css">
<script src="jquery.js" type="text/javascript"></script>
<script src="jquery.maskedinput.js" type="text/javascript"></script></head> 
<body >
<script  type="text/javascript">
$(document).ready(function(){
   $("#durprevh").mask("99:99");
});
</script>
<?php
include  ($_SERVER["DOCUMENT_ROOT"]."/intra/_connexion.php");
?>
<table width="100%" align="center" bgcolor="#FFFFFF">
                        <tr> 
                          <td height="18" valign="middle"> 
                            <div align="center"><font color="#FFFFFF" size="2" face="Verdana, Arial, Helvetica, sans-serif"> 
                              </font><font color="#FFFFFF" size="2" face="Verdana, Arial, Helvetica, sans-serif">| 
                             <a href="menu.php">Retour</a></font> 
                            </div>
                            
                        </tr>
                      </table>
<form name="form2" action="ajout_trav.php" method="POST">

<title> Dossier en cours</title>

<table width="100%" align="center">

 <?php
 if (isset($_POST['num_dossier'])) {
			 $numdossier=$_POST['num_dossier'];
		 }else {
			 $numdossier=$_GET['num_dossier'];
		 }
         $sql = "SELECT num_dossier, num_immat,client FROM fiche where num_dossier='$numdossier'";
         $sql_result = $mysqli->query($sql) or die('Erreur SQL !'.$sql.' ' .$mysqli->error);
         $row = mysqli_fetch_array($sql_result); 
         ?>
<H3>Dossier en cours</H3>
<div>
<p><label for="numimmat">Immatriculation:</label>
<?php echo strtoupper($row['num_immat']) ?></p>
<label for="numdossier">N&ordm; Dossier:</label> 
<?php echo strtoupper($row['num_dossier']) ?></p>
<input name="num_dossier" id="num_dossier" type="hidden" value="<?=$row['num_dossier']?>" >
<label for="client">Client:</label>
<?php echo strtoupper($row['client']) ?></p>
</div>
</table>
<table width="100%" align="center">
<H3>Attribution des travaux</H3>
<td><label for="nomtech">Choix du technicien :</label></td>
<td>
 <?php
         $sql = "SELECT cbarre_tech FROM technicien";
         $sql_result = $mysqli->query($sql) or die('Erreur SQL !'.$sql.' ' .$mysqli->error);
         while ($row = mysqli_fetch_array($sql_result)) 
         {
         $ntech  = $row["cbarre_tech"];
         @$option_block .= "<OPTION value=\"$ntech\">$ntech</OPTION>";
         }
         ?>
		<select  name="tech" id="tech" STYLE="COLOR: #000000; FONT-FAMILY: Verdana; FONT-SIZE: 12pt; width:250px;" class="majuscule";>;
         <option value=""> </option>
         <?php echo "$option_block"; ?> </select> <font size="1" face="Verdana, Arial, Helvetica, sans-serif" style="align:center;">&nbsp; 
</td>
<tr>
<td><label for="spe">Travaux :</label></td>
<td>
 <?php
         $sql = "SELECT nom_cat FROM categorie ";
         $sql_result = $mysqli->query($sql) or die('Erreur SQL !'.$sql.' ' .$mysqli->error);
         while ($row = mysqli_fetch_array($sql_result)) 
         {
         $spe  = $row["nom_cat"];
         @$option_block1 .= "<OPTION value=\"$spe\">$spe</OPTION>";
         }
         ?>
		<select  name="spe_tech" id="spe_tech" STYLE="COLOR: #000000; FONT-FAMILY: Verdana; FONT-SIZE: 12pt; width:250px;" class="majuscule"; >
         <option value=""> </option>
         <?php echo "$option_block1"; ?> </select> <font size="1" face="Verdana, Arial, Helvetica, sans-serif" style="align:center;">&nbsp; 
</td>
<tr>
<td><label for="dur_prev">Dur&eacute;e des travaux :</label></td>
<tr>
<td>
<td><label> Heures:Minutes</label>
<input name="durprevh"   id="durprevh" type="texte"    STYLE="COLOR: #000000; FONT-FAMILY: Verdana; FONT-SIZE: 12pt; text-align: center;"/></td><tr>
<td>
<td  align="center">
<p><button type="submit" > Ajouter</button></p>
</td>
</table>
</form>

<table width="80%" align="center" bgcolor="#FFFFFF">
                          <tr> 
                            <td width="100%" colspan="5"> <p><font size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
<?php
$Requete ="SELECT ident_trav,num_dossier,cbarre_tech,nom_cat,dur_pre FROM travaux where num_dossier='$numdossier'";  
$Req = $mysqli->query($Requete) or die('Erreur SQL !'.$Requete.' ' .$mysqli->error);
echo "<table font size=\"2\" class=\"texte\" width=\"100%\" border=\"1\" bordercolor=\"#000066\" cellspacing=\"0\" align=\"center\" face=\"Arial\">";
echo "<tr>";
echo "<td align=\"center\" bgcolor=\"#DBE8E8\">N&ordm; dossier</td>";
echo "<td align=\"center\" bgcolor=\"#DBE8E8\">Nom Tech.</td>";
echo "<td align=\"center\" bgcolor=\"#DBE8E8\">Travaux</td>";
echo "<td align=\"center\" bgcolor=\"#DBE8E8\">Dur&eacute;e pr&eacute;vue</td>";
echo "<td align=\"center\" bgcolor=\"#DBE8E8\">Supp.</td>";
echo "</tr>";
while($Result = mysqli_fetch_array($Req))
{
echo "<tr>";
echo "<td align=\"center\">". stripslashes(strtoupper($Result['num_dossier']))."&nbsp;</td>";
echo "<td align=\"center\">". stripslashes(strtoupper($Result['cbarre_tech']))."&nbsp;</td>";
echo "<td align=\"center\">". stripslashes(strtoupper($Result['nom_cat']))."&nbsp;</td>";
echo "<td align=\"center\">". stripslashes(strtoupper($Result['dur_pre']))."&nbsp;</td>";
echo "<td WIDTH=3% align=\"center\"><input type=\"button\" value=\"Sup.\" style=\"FONT-FAMILY: Verdana; FONT-SIZE: 8pt\" OnClick=\"window.location='supp_trav.php?ident_trav=".$Result['ident_trav']."&&num_dossier=".$Result['num_dossier']."'\"></td>";
}
echo "</table>";
mysqli_free_result($Req);
?>
</body>
</html>