เวลาแสดง alert ใส่เป็นไทยครับ แต่ตอนมันแสดงมันแสดงเป็น ?????????? เพิ่มอะไรตรงใหนหรือครับ

<?
include('connect.php');
include('formB1.php');
$CustID = $_GET['CustID'];
//$LastUpdate = $_POST["txtDate"];
$Company = $_POST["txtName"];
$CurAdd1 = $_POST["txtAddress"];
$Tel = $_POST["txtPhone"];
$Fax = $_POST["txtFax"];
$Email = $_POST["txtEmail"];
$Website = $_POST["txtWeb"];
$ContactPerson1 = $_POST["txtConnect"];
$ContactPosition1 = $_POST["txtPosition"];
$Credit = $_POST["txtCredit"];
$Remark = $_POST["txtComment"];
$Active = $_POST["checkbox"];
if($_POST["checkbox"] != "")
{
	$Active = "I";
}
else
{
	$Active = "A";
}

	//	$sql = "SELECT MAX(CustID) FROM tbcustomer";
	//	$query = mysql_db_query($dbname, $sql) or die("Can't Query");
	//	$cus_id = mysql_fetch_array($query);
	//	$id = $cus_id[0] + 1 ;
		
		$sql=	" UPDATE tbcustomer SET Status = 'F' WHERE CustID = '$CustID' ";
		$query = mysql_db_query($dbname, $sql) or die("Can't Query");
		if($query)
		{
			echo "	<script language='javascript'>
					alert('ลบเสร็จเรียบร้อยแล้ว');
					window.location='formB1.php';
					</script>
				 ";
		}else
		{
			echo "	<script language='javascript'>
					alert('Fail');
					window.location='fromB1.php';
					</script>
				 ";
		}
mysql_close();
?>

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