Problème d'authentification

 <?php 
		
		
		
$db=mysql_connect("localhost","root","")or die("erreur de connecxion");
mysql_select_db('ntp',$db) or die("erreur de connexion base");
$q="select login,password from inscription";
 $z=mysql_query($q);

 while($res= mysql_fetch_row($z))
 {   $pseudo=$res[0];
    $password=$res[1];
 } 
		while($_SESSION['pseudo']!=$pseudo and $_SESSION['password']!=$password)
		{
			if($_SESSION['pseudo']=='$password' and $_SESSION['password']=='$pseudo')
			
			{	echo"vous êtes connécté sous le nom de "; echo $_SESSION['pseudo'];	}
				
				
				else
				{
					echo"
						<form method='post'>
						<table>
							<tr><td>Pseudo:</td></tr>
							<tr><td><input type='text' name='pse' size='20'/></td></tr>
							<tr><td>Mot de passe:</td></tr>
							<tr><td><input type='password' name='pass' size='20'/></td>
							</tr>
							<tr><td><center><input type='submit' name='id' value='Envoyer' /></center></td></tr>
						</table>
						</form>";
					if(isset($_POST['id']))
					{
					$_SESSION['pseudo']=$_POST['pse'];
					$_SESSION['password']=$_POST['pass'];
				    }
				}
				
		
		}
		
		
		
		?>