updating data in a database

Here's what i basically want to do :

A user, in this case a teacher, by selecting an appropriate option to be able to update data concerning his students absencies reports.

Here's what my table for the students' absencies looks like (nevermind the greek)

http://i42.tinypic.com/ofwuhu.jpg


And here's what my browser shows up (yes thats in greek too but you'll get the idea):

http://i43.tinypic.com/553q5j.jpg

Here's my code :


if ($teacherclass=="e") // if teacher selects the EDIT option from a dropdown menu
{
include ("config.php"); // just plain connecting to the database
$con=mysql_connect($dbhost,$dbuser,$dbpass)
or die("Cannot connect to database");
mysql_select_db('dbusers');
mysql_query("set names utf8;"); //


echo "<br>Your class is :";

$myclass= $_SESSION['myclass']['class']; // That's a session started when the user logged in with his class.

echo $myclass; //e.g. B1
echo "<br>";
echo "<br>";


$query = "SELECT * FROM absencies WHERE class = '$myclass' " ; //shows all students that are in the same class as the teacher/user is
$result = mysql_query($query);



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


echo "<table width=800 border=1 cellpading=1>
<tr>
<td><b>Real name:</b></td>
<td>".$row['realname']."</td>

</tr>
<tr>
<td> Unjustified absecnies of Year 1 , Semester 1 :</td>
<td>".$row['A1a']."</td>
<td>

<form action='absencies.php' method='POST' accept-charset='UTF-8'>

<input type='hidden' name='submitted' value=1>

<input type='text' name='A1a'>
<input type='submit' name='submit' value='Edit'></td>

</tr>
<tr>
<td>Justified absencies of Year 1, Semester 1 :</td>
<td>". $row['A1d']."</td>
<td><input type='text' name='A1d'><input type='submit' name='submit' value='Edit'></td>
</tr>
<tr>
<td>unjustified absencies of Year 1, semester 2:</td>
<td>".$row['A2a']."</td>
<td><input type='text' name='A2a'><input type='submit' name='submit' value='Edit'></td>
</tr>
<tr>
<td>Justified absencies of Year 1 , semester 2:</td>
<td>".$row['A2d']."</td>
<td><input type='text' name='A2d'><input type='submit' name='submit' value='Edit'></td>
</tr>



etc. for all semesters


...

</table>





if ($_POST['submitted']==1) {

// THIS WHERE I SHOULD enterMY queries *update" etc.


}



}
}


My problem IS HOW TO UPDATE the fields withouf UPDATING all of them but one at a time.

Ok I used the loop to show the students status however i dont want to get a loop updating every single student. But just the one i choose.

You'd need to write separate queries, like
if(isset($_POST['A1d']) /* && some conditions to validate the value comes through this input*/)
mysql_query(/*"query to update the corresponding fled" */) or die(mysql_error());