ขอคำแนะนำเกี่ยวกับการ update ค่าของ checkbox ด้วยครับ

</tr>						
	      <tr>
								  <td>&nbsp;</td>
								  <td>access</td>
		 <br>
		 <td width="409" align="center">
		<?php
		 if($row['chk1']=="on"){
		 ?>
		 <input type="checkbox" name="manager" id="checkbox" checked="checked" />
		<label for="checkbox"></label>
		 <?
		 }
		else{
		 ?>
		<input type="checkbox" name="chk1" id="checkbox" />
		<label for="checkbox"></label>
		<?
		 }
		?>chk1</td>
		<br>			 
		
		<td width="409" align="center">
		<?php
		 if($row['chk2']=="on"){
		 ?>
		 <input type="checkbox" name="chk2" id="checkbox" checked="checked" />
		<label for="checkbox"></label>
		 <?
		 }
		else{
		 ?>
		<input type="checkbox" name="chk2" id="checkbox" />
		<label for="checkbox"></label>
		<?
		 }
		?>chk2</td>
		

		<td width="409" align="center">
		<?php
		 if($row['chk3']=="on"){
		 ?>
		 <input type="checkbox" name="chk3" id="checkbox" checked="checked" />
		<label for="checkbox"></label>
		 <?
		 }
		else{
		 ?>
		<input type="checkbox" name="chk3" id="checkbox" />
		<label for="checkbox"></label>
		<?
		 }
		?>chk3</td>
		<br>		 
		
		<td width="409" align="center"><?php
		 if($row['chk4']=="on"){
		 ?>
		 <input type="checkbox" name="chk4" id="checkbox" checked="checked" />
		<label for="checkbox"></label>
		 <?
		 }
		else{
		 ?>
		<input type="checkbox" name="chk4" id="checkbox" />
		<label for="checkbox"></label>
		<?
		 }
		?>chk4</td>
		<br>		 
		
		<td width="409" align="center">
		<?php
		 if($row['chk5']=="on"){
		 ?>
		 <input type="checkbox" name="chk5" id="checkbox" checked="checked" />
		<label for="checkbox"></label>
		 <?
		 }
		else{
		 ?>
		<input type="checkbox" name="chk5" id="checkbox" />
		<label for="checkbox"></label>
		<?
		 }
		?>chk5</td>
		<br>		 

<?


$id=$_REQUEST[id];

$sql="Update member set Password='".$_POST["txtPass"]."',Name='".$_POST["txtName"]."',LastName='".$_POST["txtLastName"]."',Gender='".$_POST["rdoGender"]."',Address='".$_POST["txtAddress"]."',Province='".$_POST["txtProvince"]."',ZipCode='".$_POST["txtZipCode"]."',Tel='".$_POST["txtTel"]."',Email='".$_POST["txtEmail"]."' where MemberID=$id";
$result=mysql_query($sql) ;

$sql1 ="update member set 
manager     =  '$manager'

, admin     =  '$admin'

, sealer    =  '$sealer'

, delivery  =  '$delivery' 
 
, werehouse =  '$werehouse'

where MemberID ='$id'  "; 

$result=mysql_query($sql1) ;
if($result) {echo "<br>แก้ไขเรียบร้อย";} 
					echo"<script language='JavaScript'>";
					  echo"alert('เพิ่มข้อมูลเรียบร้อย');";
					  echo"window.location='member_staff.php';";
					  echo"</script>";	

?>