I wanted some help in php.

I am making a website for a university in php which will have a information to be displayed for every teacher ,so the same page will be visible in different information depend on the login email !

right now, i have created my database and script of login ,but it's without session or cookies ,do i need those two to display a different information with mysql query thanks in advance!
----------login.php----------

```
   ?php
require_once('init.php');
include_once("scripts/connect.php");
$login_error = "";
$email = "";
$password= "";

if(isset($_GET['login'])){

    $email = strip_tags(mysql_real_escape_string($_POST['email']));
    $password = strip_tags(mysql_real_escape_string($_POST['password']));

    $sql = mysql_query("SELECT mail_enseignant,Nom_Enseignant,Mot_de_passe FROM enseignant WHERE mail_enseignant='".$email."' AND Mot_de_passe='".$password."' LIMIT 1");
 echo mysql_error(); 
    if(mysql_num_rows($sql) == 1){
        $row = mysql_fetch_assoc($sql);
        $_SESSION['mail_enseignant'] = $row['mail_enseignant'];
        $_SESSION['Nom_Enseignant'] = $row['Nom_Enseignant'];
        $_SESSION['Mot_de_passe'] = $row['Mot_de_passe'];

        header("Location: note-on.php?email=$email");
        exit();
    }else{
        $login_error="invalid Information...";
    }
    }
?>
<h3>Ensiegnant Login Below</h3>
   <form action="?login" method="post" >
      <fieldset>
        <legend>Enseingant Login</legend>

        <p>Mail_Ens: <input type="text" name="email" value="<?php echo $email;?>" /></p>
        <p>Password: <input type="password" name="password" value="<?php echo $password;?>" /></p>
        <p>
            <?php if (isset($login_error) && ($login_error != "")){
                echo "<p style='margin-right: 10px;color: #ff0000'>".$login_error."</p>";
            }?>
        <input type="submit" value="Login Enseignant" name="submit_login"/></p>
      <!--  <input type="image" src="images/sign_in.gif" id="signin" alt="Sign In" />-->
      </fieldset>
    </form>

```

and this is the page that i wanna desplay a diffrent informaition based on the email of teacher logged in with 

--------note-on.php----------

```
   <div id="left_column">
      <div class="holder">
          <h2 class="title">Speciality & Groupe</h2>
        <ul class="nostart">
          <select name="select" class="textfields" id="Speciality">
            <option id="0">-- Select Speciality --</option>
            <?php echo $_SESSION['mail_enseignant']; ?> 
            <?php   
              if(isset($_GET['email'])){
                $getallSpeciality = mysql_query("select Nom_Specialite from specialite where enseignant.mail_enseignant='".$email."'and enseignant.Id_Enseignant=affecte.Id_Enseignant and affecte.Id_Groupe=groupe.Id_Groupe and specialite.Id_Specialite=groupe.Id_Specialite");
                while($viewallSpeciality = mysql_fetch_array($getallSpeciality)){
                ?>
                <option id="<?php echo $viewallSpeciality['Id_Specialite']; ?>">
                <?php echo $viewallSpeciality['Nom_specialite'] ?></option>
                <?php }} ?>
          </select>
        </ul>
      </div>

```