ทำการ update ค่า checkbox ไม่ได้ค่ะ ต้องแก้ยังไงคะ

echo $sq1;

<tr>
     		<td valign="top">Relavant Keyfactor</td>
        	<td>
        	<?php   
         	$sql1 = " SELECT relevantkf.keyID , keyfactor.keyName  
          	FROM relevantkf INNER JOIN keyfactor ON relevantkf.keyID = keyfactor.keyID  
          	INNER JOIN itemreview ON relevantkf.itemID = itemreview.itemID  
          	WHERE itemreview.itemID ='$itemID' ";  
      		$objQuery = mysql_query($sql1);  
        	
			while($fetch = mysql_fetch_assoc($objQuery)){  
        	$i=0;
        	while($i<sizeof($key)) 
		{ 
        
        if($key[$i] == $fetch["keyID"])
			{ ?>
				<li>     
        			<input type="checkbox" name="chkKey[]" 
        			value= "<?php $fetch["keyID"];?>" checked /> 
        			<?php echo $fetch["keyName"];?>
        		</li> 
			<?php break; }
			$i++; ?>    
        <?php  } 
		
		if($i== sizeof($key)){ ?>
			<li> 
         		<input type="checkbox" name="chkKey[]" 
        		value= "<?php $fetch["keyID"];?>"  /> 
        		<?php echo $fetch["keyName"];?>
        	</li> 
		<?php } }?> 
		
		 

        </td>
    </tr>