update sql ไม่ได้ครับ ไม่ฟ้อง error แต่มันไม่ยอมลงฐานข้อมูลครับ

<?
include "conn.php";
?>

<?
	$Page=$_REQUEST['Page'];
	$Sequence=$_REQUEST['Sequence']; 
	$Employee=$_REQUEST['Employee'];
	$Name_Thai=$_REQUEST['Name_Thai']; 
	$Name_Eng=$_REQUEST['Name_Eng'];
	$Department=$_REQUEST['Department'];
	$login=$_REQUEST['login'];
	$Email=$_REQUEST['Email'];
	
		echo $Sequence ; echo "<br>" ;
		echo $Employee ; echo "<br>" ;
		echo $Name_Thai ; echo "<br>" ;
		echo $Name_Eng ; echo "<br>" ;
		echo $Department ; echo "<br>" ;
		echo $login ; echo "<br>" ; 
		echo $Email ; echo "<br>" ;
		echo $Page ; echo "<br>" ;echo "<br>" ;echo "<br>" ;echo "<br>" ;
	
	if($Employee != ""){
		$u="update customer SET Sequence='$Sequence',Name_Thai='$Name_Thai',Name_Eng='$Name_Eng', Department='$Department',Email='$Email',Login='$Login',Employee='$Employee', where Employee='$Employee'";
		
		$result = mysql_query($u);
		echo $u ;
		echo"แก้ไขข้อมูลเรียบร้อยแล้ว";
		
	}else{
		echo "ไม่มีข้อมูล";
		$u="update customer SET Sequence='$Sequence',Name_Thai='$Name_Thai',Name_Eng='$Name_Eng', Department='$Department',Email='$Email',Login='$Login',Employee='$Employee', where Employee='$Employee'";
	} 
	// echo "<META HTTP-EQUIV=\"Refresh\" CONTENT=\"10;URL=index.php?Page=$Page  \">";
	mysql_close();
?>
<div align="center">
<br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><a href="index.php?value&Page=<?=$Page=$_REQUEST['Page'];?>">กลับ index</a> </div>