$ajax my script dosent Works, help.

$ajax my script dosent Works, help.

Hello i use $ajax function for my website but the script which I have write works not correctly
Here is the script:

<script src="jquery-1.4.2.js"></script>
<script language="javascript">


$().ready(function() {
function get_tableau(client, responsable, present, tri, sens, tri2, sens2, ladate) {
$.ajax({
type:"POST",
url:"tab.php",
data:"client="+client+"&responsable="+responsable+"&present="+present+"&tri="+tri+"&sens="+sens+"&tri2="+tri2+"&sens2="+sens2+"&ladate="+ladate+"",
dataType:"html",
success: function(html) 
{
<!--------------------------------------------------->
$("#tableau").html(html);
<!--------------------------------------------------->
$(".saisie").change(function() 
{
alert("saisie");
$.ajax({
type: "POST",
url: "script.php",
data: "CC_M_VALEUR="+ $(this).parent().find("#CC_M_VALEUR").val() + "&ADR_ID=" + $(this).parent().find("#ADR_ID").val() + "&EXO_CODE=" + $(this).parent().find("#EXO_CODE").val() + "&FORMULE_CODE=" + $(this).parent().find("#FORMULE_CODE").val() +"",
datatype:"html",
BUG beforesend: function(){alert("beforesend");},
BUG complete: function(){alert("complete");},
BUG error: function(xhr, status, error){$("#div_resultat").h(xhr.responseText);},
BUG success: function(html) {alert("success");}
});
});
<!--------------------------------------------------->
$(".Code").click(function () {
alert("tri code");
get_tableau("filtrer", "", "present", "ADR_NOM", $(this).parent().val(),"","",$("#listeDate").val());
});
<!--------------------------------------------------->
$(".Libelle").click(function () {
alert("tri Libelle");
get_tableau("filtrer", "", "present", "ADR_NOM", $(this).parent().val(),"","",$("#listeDate").val());
});
}
});
}


get_tableau("filtrer", "", "present", "ADR_NOM", "ASC","","",$("#listeDate").val());

    $("#filtrer").click(function()
{
 alert("filtre");
 get_tableau("filtrer",$("#responsable").val(),$("#present").val());
});

});
</script>