รบกวนดูระบบ ตระกร้าสินค้า add ไม่ผ่าน ฟอร์มสินค้านะครับส่งค่า

<?
session_start();
session_register("sess_id");
session_register("sess_name");
session_register("sess_price");
session_register("sess_stock");
session_register("sess_num");

if (count($sess_id)=="0") {
	$check=1;
} else  if (!in_array($id_prd, $sess_id)) {
	$check=1;
}

if ($check==1) {
	include "./include/config.php";
	$sql="select * from product where id_prd='$id_prd' ";
	$result=mysql_db_query($dbname,$sql);
	$rs=mysql_fetch_array($result);

	$sess_id[]=$rs[id_prd];
	$sess_name[]=$rs[name_prd];
	$sess_price[]=$rs[price_prd];
	$sess_stock[]=$rs[stock];
	$sess_num[]=1;

}
header("Location: basket.php");
?>

<?
session_start();
if (!session_is_registered("sess_userid")) 
$id_prd=$_GET[id_prd];  
 include "include/config.php";


	if (count($sess_id)==0) {
			echo "ยังไม่มีสินค้าอยู่ในตะกร้าค่ะ <BR>";
	} else {

for ($i=0;$i<count($sess_id);$i++) {
					$total_unit=$sess_num[$i]*$sess_price[$i];
					$total=$total+$total_unit;
					echo "
				          <TR>
								<TD><CENTER>
									<INPUT TYPE='checkbox' NAME='prd_del[]' VALUE='$sess_id[$i]'>
								</CENTER></TD>
								<TD>$sess_name[$i]</TD>
								<TD><CENTER>$sess_stock[$i]</CENTER></TD>
								<TD><CENTER>
									<INPUT TYPE='text' NAME='prd_num[]' VALUE='$sess_num[$i]' SIZE='4' >
								</CENTER></TD>
								<TD><CENTER>$sess_price[$i]</CENTER></TD>
								<TD><CENTER>$total_unit</CENTER></TD>
						 </TR>";
				}
?>