insert values from multiple checkbox into database PHP [duplicate]

Possible Duplicate:
handling checked checkboxes PHP

i have this problem. I have a webpage that show car registration number and it's violation. And we can change the status of the violation from 1=not treated to 2=treated. I want to use multiple check box to choose which car registration status that i want to change here's the screenshot of my web

)

how i change the status of both car registration number ? here's my webpage code

 <div id="content">
    <div class="content_item">
    <?php
       $con = mysql_connect("localhost","fpjarmul","fpjarmul");
        if (!$con)
          {
          die('Could not connect: ' . mysql_error());
          }

        mysql_select_db("fpjarmul", $con);

        $query = "SELECT * FROM laporan WHERE status = '1'";
        $result = mysql_query($query);

        while($row = mysql_fetch_array($result, MYSQL_ASSOC))
        {?>
            <form action="ubahdata.php" method="post">
                <input type="checkbox" name="idlaporan" value="<?php echo $row['idlaporan'] ?>" /><?php echo "ID : {$row['idlaporan']}" ?><br />
                <?php echo  "Nomor Polisi : {$row['platkendaraan']} <br>" .
                            "Status : {$row['status']} <br>" . 
                            "Tanggal Laporan : {$row['tanggallapor']} <br><br>"; ?>

        <?php   
        } 
        ?>  
                <input type="submit">
            </form>

and here's my script

 <?php include 'header.php'; ?>
 <?php
$con = mysql_connect("localhost","fpjarmul","fpjarmul");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

 mysql_select_db("fpjarmul", $con);

 $sql=("UPDATE laporan set status='2' where idlaporan='$_POST[idlaporan]'");

 if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
echo "1 record added";
?> 
 <?php include 'footer.php'; ?>