Service
$query_rs2 = "select * from po where po_no='$po'";
$rs2 = mysql_query($query_rs2) or die (mysql_error());
$row_rs2 = mysql_fetch_assoc($rs2);
$truck_bill=$row_rs2['truck_bill'];
$sql = "select * from po where po_no='$po' ";
$result = mysql_query($sql);
if(!$result)
return 0;
$result1 = mysql_fetch_array($result);
$truck_bill=$result1[truck_bill];
echo "Bill no : ". $truck_bill;
?>