ajax เพิ่ม,แก้ไข,ลบ มีปัญหาครับ แก้ไขกับลบ ผ่านแล้ว แต่ติดที่เพิ่มข้อมูลไม่ได้สักที เรียนผู้รู้ช่วยทีครับ

<script language="JavaScript">
	   var HttpRequest = false;

		<!-- // ********************************* -->
		function checkBrowser(){
				  if (window.XMLHttpRequest) { // Mozilla, Safari,...
					 HttpRequest = new XMLHttpRequest();
					 if (HttpRequest.overrideMimeType) {
						HttpRequest.overrideMimeType('text/html');
					 }
				  } else if (window.ActiveXObject) { // IE
					 try {
						HttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
					 } catch (e) {
						try {
						   HttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
						} catch (e) {}
					 }
				  }

				  if (!HttpRequest) {
					 alert('Cannot create XMLHTTP instance');
					 return false;
				  }
		}
		<!-- //************************************** -->

	   function doCallAjax(Mode) {
		  HttpRequest = false;
		  checkBrowser();

		  var url = 'formInsert/setting/accountListSave.php';

		  if(Mode == "ADD") {
				// var pmeters = "tCustomerID=" + encodeURI( document.getElementById("txtCustomerID").value) +
				var pmeters ="tListID=" + encodeURI( document.getElementById("alistID").value ) +
							"tListName=" + encodeURI( document.getElementById("alistName").value ) +
							"&tListDetail=" + encodeURI( document.getElementById("alistDetail").value ) +
							"&tMode=" + Mode;
				alert(pmeters);
		  }

		  if(Mode == "UPDATE") {
			  var pmeters = "tListID=" + encodeURI( document.getElementById("listID").value) +
							"&tListName=" + encodeURI( document.getElementById("listName").value ) +
							"&tListDetail=" + encodeURI( document.getElementById("listDetail").value ) +
							"&tMode=" + Mode;
		  }

		  if(Mode == "LIST") {
			var pmeters = "";
		  }

			HttpRequest.open('POST',url,true);

			HttpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded;charset=utf-8");
			HttpRequest.setRequestHeader("Content-length", pmeters.length);
			HttpRequest.setRequestHeader("Connection", "close");
			HttpRequest.send(pmeters);


			HttpRequest.onreadystatechange = function()
			{

				 if(HttpRequest.readyState == 3)  // Loading Request
				  {
					   document.getElementById("mySpan").innerHTML = "<image src='images/ajax_load.gif'>";
				  }

				 if(HttpRequest.readyState == 4) // Return Request
				  {
				    document.getElementById("editForm").style.display = 'none';
				    document.getElementById("addForm").style.display = 'none';
					document.getElementById("startAdd").style.display = '';

				   document.getElementById("listID").value = '';
				   document.getElementById("listName").value = '';
				   document.getElementById("listDetail").value = '';

				   document.getElementById("mySpan").innerHTML = HttpRequest.responseText;


				  }

			}

	   }

	   function ShowADD() {

			 document.getElementById("addForm").style.display = '';
			 document.getElementById("editForm").style.display = 'none';
			 document.getElementById("startAdd").style.display = 'none';

			document.getElementById("alistID").value ='';
			document.getElementById("alistName").value = '';
			document.getElementById("alistDetail").value = '';
	   }


	   function ShowEdit(slistID,slistName,slistDetail) {

			document.getElementById("editForm").style.display = '';
			document.getElementById("addForm").style.display = 'none';
			 document.getElementById("startAdd").style.display = 'none';

			document.getElementById("listID").value = slistID;
			document.getElementById("listName").value = slistName;
			document.getElementById("listDetail").value = slistDetail;
	   }


	 	function ajaxDelete(Mode, listID) {
				HttpRequest = false;
				checkBrowser();
				//alert('test');
				var url = 'formInsert/setting/accountListSave.php';
				var pmeters = "tListID=" + listID + "&tMode=" + Mode;

				HttpRequest.open('POST',url,true);
				HttpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded;charset=utf-8");
				HttpRequest.setRequestHeader("Content-length", pmeters.length);
				HttpRequest.setRequestHeader("Connection", "close");
				HttpRequest.send(pmeters);

				HttpRequest.onreadystatechange = function(){

					 if(HttpRequest.readyState == 3)  // Loading Request
					  {
						  document.getElementById("mySpan").innerHTML = "Now is Loading...";
					  }

					 if(HttpRequest.readyState == 4) // Return Request
					  {
						  // document.getElementById("mySpan").innerHTML = HttpRequest.responseText;
						  doCallAjax('LIST');
					  }
				}

		}

	</script>

<body Onload="JavaScript:doCallAjax('LIST');">
<form name="frmMain">
	<span id="editForm" style="display='none';">
		<table width="700" border="1">
			<tr>
				<th> <div align="center">รหัสรายการ</div></th>
				<th> <div align="center">ชื่อรายการ</div></th>
				<th> <div align="center">รายละเอียด</div></th>
			</tr>

			<tr>
				<td><div align="center"><input type="text" class="form-control" name="listID" id="listID" size="5" disabled="true"></div></td>
				<td><input type="text" class="form-control" name="listName" id="listName" size="20"></td>
				<td><input type="text" class="form-control" name="listDetail" id="listDetail" size="20"></td>
			</tr>
		</table>

		<input type="button" name="btnUpdate" id="btnUpdate" value="Update" OnClick="JavaScript:doCallAjax('UPDATE');">
		<input type="button" name="btnCancelUpdate" id="btnCancelUpdate" value="CancelUpdate" OnClick="JavaScript:doCallAjax('LIST');">
		<br><br>
	</span>


	<span id="addForm" style="display='none';">
		<table width="700" border="1">
			<tr>
				<th> <div align="center">รหัสรายการ</div></th>
				<th> <div align="center">ชื่อรายการ</div></th>
				<th> <div align="center">รายละเอียด</div></th>
			</tr>

			<tr>
				<td><div align="center"><input type="text" class="form-control" name="listID" id="listID" size="5" ></div></td>
				<td><input type="text" class="form-control" name="listName" id="listName" size="20"></td>
				<td><input type="text" class="form-control" name="listDetail" id="listDetail" size="20"></td>
			</tr>
		</table>

		<input type="button" name="btnADD" id="btnADD" value="ADD" OnClick="JavaScript:doCallAjax('ADD');">
		<input type="button" name="btnCancelADD" id="btnCancelADD" value="CancelADD" OnClick="JavaScript:doCallAjax('LIST');">
		<br><br>
	</span>

	<div id="startAdd" style="display='none';">
		<input type="button" name="btnShowADD" id="btnShowADD" value="ADD" OnClick="JavaScript:ShowADD();">
	</div>

	<span id="mySpan"></span>
</form>
</body>

<?php
include ("../../config/config_DB.php");

$strMode = $_POST["tMode"];
$strID = $_POST["tlistID"];

if($strMode == "ADD") {
  $strSQL = "INSERT INTO tb_account_list ";
  $strSQL .="(List_ID,List_Name,List_Detail) ";
  $strSQL .="VALUES ";
  $strSQL .="('".$_POST["tListID"]."','".$_POST["tListName"]."','".$_POST["tListDetail"]."') ";
  $objQuery = mysql_query($strSQL);

} else if($strMode == "UPDATE") {
  $strSQL = "UPDATE tb_account_list SET ";
  $strSQL .="List_Name = '".$_POST["tListName"]."' ";
  $strSQL .=",List_Detail = '".$_POST["tListDetail"]."' ";
  $strSQL .="WHERE List_ID = '".$_POST["tListID"]."' ";
  $objQuery = mysql_query($strSQL);

} else if($strMode == "DELETE") {
  $strSQL = "DELETE FROM tb_account_list ";
  $strSQL .="WHERE List_ID = '".$_POST["tListID"]."' ";
  $objQuery = mysql_query($strSQL);
}

$strSQL = "SELECT * FROM tb_account_list ORDER BY List_ID ASC ";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
?>
<table border="1">
  <tr>
    <th><div align="center">รหัสรายการ</div></th>
    <th><div align="center">ชื่อรายการ</div></th>
    <th><div align="center">รายละเอียด</div></th>
    <th><div align="center">Edit</div></th>
  <th><div align="center">Delete</div></th>
  </tr>
<?
while($objResult = mysql_fetch_array($objQuery))
{
?>
  <tr>
    <td><div align="center"><?=$objResult["List_ID"];?></div></td>
    <td><?=$objResult["List_Name"];?></td>
    <td><?=$objResult["List_Detail"];?></td>
    <td align="center"><a href="JavaScript:ShowEdit('<?=$objResult["List_ID"];?>','<?=$objResult["List_Name"];?>','<?=$objResult["List_Detail"];?>')">Edit</a></td>

  <td align="center"><a href="JavaScript:ajaxDelete('DELETE','<?=$objResult["List_ID"];?>');" onclick="return confirm('Are you sure you want to delete?')">Del</a></td>
  </tr>
<?
}
?>
</table>
<?
mysql_close();
?>