ช่วยดูให้หน่อยค่ะว่าทำไมมันไม่ขึ้น popup เป็นภาษาไทย ช่วยหน่อยค่ะ

<? session_start();
if (count($pro_del)==0) {
$pro_del=array();
}
for ($i=0;$i<count($sess_id);$i++) {
if (!in_array($sess_id[$i],$pro_del)) {
$temp_id[]=$sess_id[$i];
$temp_bb[]=$sess_bb[$i];
$temp_name[]=$sess_name[$i];
$temp_price[]=$sess_price[$i];
$temp_num[]=$number[$i];

include "connect.php";
$sql="select * from product  WHERE pro_id='$sess_bb[$i]'";
$result=mysql_db_query($dbname,$sql);
while($rs=mysql_fetch_array($result)){
			$number2=$rs[pro_num];
			if($number2<$number[$i]) 
			echo "<script>alert('จำนวนสินค้าไม่เพียงพอค่ะ');window.location = 'basket.php';</script>";
		}
}
}
$sess_id=$temp_id;
$sess_name=$temp_name;
$sess_price=$temp_price;
$sess_num=$temp_num;

if ($calculate) { 
header("Location: basket.php");
} else if ($complete) {
header("Location: pro_order.php");
}
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />