ecco parte della pagina del login:

<?php

session_start();
include("cn.php");

$msg = "";

if (isset($_POST['Submit']))
{

$username = $_POST['admin'];
$password = $_POST['admin'];

$result = mysql_query("Select * From admin where username='$username'",$link);

if(mysql_num_rows($result)>0)
{
$row = mysql_fetch_array($result, MYSQL_BOTH);
if($password == $row["password"])
{

$_SESSION['adminok'] = "ok";
$_SESSION['username'] = "username";
$_SESSION['password'] = "password";
header("Location: admin.php");

}
else
{
$msg = "Password incorrect";
}
}
else
{
$msg = "Username incorrect";
}

}
?>

ho messo le due pass admin admin e basta....