if(isset($_COOKIE['ID_my_site']))
 {
    $username = $_COOKIE['ID_my_site'];
    $pass = $_COOKIE['Key_my_site'];
        $check = mysql_query("SELECT * FROM users WHERE username = '$username'")or die(mysql_error());
    while($info = mysql_fetch_array( $check ))
        {


        if ($pass != $info['password'])
            {           echo "You are not logged in.";
            }


    else
            {
                echo "Welcome $username,  you are logged in.";
            }
        }
        }