ทำยังไงให้ ช่องของ "ลำดับที่" นำตัวเลขที่เป็น company_id ของ $tblname2 ในช่อง ที่เป็น read only เก็บลงในตาราง $tblname3 คะ

<?
  require_once('config.inc.php');
$sql = "select * from $tblname 
  left join $tblname2 on $tblname.company_id=$tblname2.company_id
  left join $tblname3 on $tblname.company_id=$tblname3.company_id";   
  $dbquery = mysql_db_query($dbname, $sql);
  $num_rows = mysql_num_rows($dbquery);

print "<h3>จำนวนรายชื่อบริษัททั้งหมด".mysql_num_rows($dbquery)." บริษัท</h3>";

  if($_POST['Add'])
{  require_once('config.inc.php');
$sql = "select * from $tblname
  left join $tblname2 on $tblname.company_id=$tblname2.company_id
  left join $tblname3 on $tblname.company_id=$tblname3.company_id
  left join $tblname4 on $tblname.company_id=$tblname4.company_id";
$commercial_id  = $_POST['commercial_id'];
$company_name = $_POST['company_name'];
$regist_date = $_POST['regist_date'];
$detail = $_POST['detail'];
$company_id= $_POST['commpany_id'];


//  เพิ่มลงฐานข้อมูล
$sql_add = "insert into cdb_company (commercial_id, company_name,  regist_date) values ('$commercial_id', '$company_name','$regist_date')";
//$sql_add = "insert into cdb_company set
//commercial_id = '$commercial_id' , company_name = '$company_name', regist_date = '$regist_date'";

mysql_query($sql_add) or die(mysql_error());
$sql_add2 = "insert into cdb_detail (detail,company_id) values ('$detail','$company_id')";
//$sql_add2 = "insert into cdb_detail set
//detail = '$detail'";

mysql_query($sql_add2) or die(mysql_error());

echo "<meta http-equiv='refresh' content='1;URL=index1.php' />";


}
?>
<?php mysql_query('SET CHARACTER SET tis620'); ?>
<link rel="stylesheet" type="text/css" style="position:fixed" href="epoch_styles2.css" />
<script type="text/javascript" src="epoch_classes.js"></script>
<script type="text/javascript">

   var dp_cal;   
   var dp_cal2;
   
/*You can also place this code in a separate file and link to it like epoch_classes.js*/
   
window.onload = function () {
   dp_cal     = new Epoch('epoch_popup','popup',document.getElementById('regist_date'));
   
};


</script> 

<form id="form1" name="form1" method="post" action="index2.php">
  <table width="972" border="0">
    <tr>
      <td width="151" height="37">ลำดับที่</td>
      <td width="811"><input id="company_id" name="company_id" type="company_id" value=<?php $begin2= print mysql_num_rows($dbquery)+1;if(!$_GET) {echo $begin; }?> <?if($_GET['company_id'] == $_GET['company_id']){echo $_GET['company_id'];}?> readonly / >
      </td>
    </tr>
  </table>