PHP Checkbox ordered by click and send thru post form to a news sql query on the clicked order

I have a code on page1.php where I have an array of checkbox populated with mysql data through a query. I can successfully submit the value of the checked checkbox to the page2.php. But I want to submit it according to the sequence the checkbox was checked by the user. I´ve seen that jQuery can do this, but i don´t know how and where to place the jQuery code.

My intention is to show on page2.php what the user selected, on a specific order, from the page1.php form

PS: It doesn´t need to be in jQuery.

page1.php

<?php
$query = "SELECT * FROM imoveis";
$result = mysql_query($query,$conn);
?>

<form action="page2.php" method="post">

<input type="submit" value="Create" id="enviarButton"/></td>

<br><br>

<table border="1">
    <?
    $i = 0;

    echo "<tr>";

         while($imovel = mysql_fetch_array($result)){

            $name = $imovel['empreendimento'];
            $id = $imovel['id'];

?>   

        <td>
            <?=$name;?><br>
            <input type="checkbox" name="op_imovel[]" value="<?=$id;?>">
        </td>
<?
           $i++;
           if(($i % 3) == 0){
                  echo "</tr><tr>";
                  }
           }

mysql_close();

?>

</table>
</form>

.

page2.php

<?php
  $checkbox = $_POST['op_imovel'];

  if (is_array($checkbox) && count($checkbox) > 0){
        $res = '';
        $tot = count($checkbox) - 1;
        for ($y = 0; $y <= $tot; $y++) {

            $res .=$checkbox[$y];

            if ($y < $tot)
                $res .= ",";
        }

    }

  $query = "SELECT * FROM emps WHERE id IN ($res)";
  $result = mysql_query($query,$conn);
?>

<br>


<div align="center">

        <table border="1">

<?
$i = 0;
echo "<tr>";

    if (is_array($checkbox) && count($checkbox) > 0){
        while($imovel = mysql_fetch_array($result)){ 

            $name = ($imovel['emp']);
?>
                <td>
                    <p>
                        <?= $name;?>
                    </p>

                </td>
<?
           $i++;
           if(($i % 3) == 0){
                  echo "</tr><tr>";
           }


        }       

    }   
?>      


</div>

<?  mysql_close(); ?>