Sort ข้อมูลโดยคลิกจากหัวของ table ผมอยาก sort data จากการคลิกที่หัวของ ตารางอะครับ

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					<table width="100%" border="0" cellspacing="1"  class="tablesorter">
					<thead>
						<tr>
							<th>Contract Partner</th>
							<th>Contract Type</th>
							<th>Contract Subject</th>
							<th>Contract Expire</th>
							<th>Remaining time</th>
						</tr>
					</thead>	
<?php

// MySQL Function - Include Connection File (Create by Dreamweaver)
$hostname_contract_manager = "localhost";
$database_contract_manager = "xxxxxxx";
$username_contract_manager = "xxxxxxxx";
$password_contract_manager = "";
$contract_manager = mysql_pconnect($hostname_contract_manager, $username_contract_manager, $password_contract_manager) or
    trigger_error(mysql_error(), E_USER_ERROR);

// PHP & MySQL Function - Query records from MySQL (Contract)
// Sort and Order Functions
mysql_select_db($database_contract_manager, $contract_manager) or die("Can Not Connect to Database Server");

$query_ContractManage =
"SELECT
Contract_Partner,
Contract_Type,
Contract_Subject,
Contract_Expire,
(to_days(`contract_details`.`Contract_Expire`) - to_days(curdate())) as countdate

FROM
contract_details, contract_user
where (to_days(`contract_details`.`Contract_Expire`) - to_days(curdate())) <= 30";
$ContractManage = mysql_query($query_ContractManage, $contract_manager) or die(mysql_error());

// MySQL Function - Record Verification
$totalRows_ContractManage = mysql_num_rows($ContractManage);
if ($totalRows_ContractManage <> 0)
{
    //send mail all data that mySql have
    $ContractManage = mysql_query($query_ContractManage);


            while ($row_ContractManage = mysql_fetch_assoc($ContractManage))
            {
                $Contract_ID = $row_ContractManage[Contract_ID];
                $Contract_Partner = $row_ContractManage[Contract_Partner];
                $Contract_Type = $row_ContractManage[Contract_Type];
                $Contract_Subject = $row_ContractManage[Contract_Subject];
                $Contract_Expire = $row_ContractManage[Contract_Expire];
                $countExpireDate = $row_ContractManage[countdate];
                $Admin_Notification = $row_ContractManage[Admin_Notification];
			?>
					<tbody>
						<tr valign='top'>
							<td align='left'><?= $Contract_Partner?></td>
							<td align='center'><?= $Contract_Type?></td>
							<td align='center'><?= $Contract_Subject?></td>
							<td align='center'><?= $Contract_Expire?></td>
							<td align='center'><?= $countExpireDate?></td>				
						</tr>
					</tbody>
			<?php 
                $Row_No++;
            }mysql_close();}
			?>
					</table>