function checklogin()
    {
        if (!empty($_SESSION['users_login']) AND !empty($_SESSION['users_pass'])) {
            $count = mysql_num_rows(mysql_query("SELECT * FROM users WHERE users_login='" . $_SESSION['users_login'] . "' AND users_pass='" . $_SESSION['users_pass'] . "'"));
        } else {
            $count = 0;
        }
        return $count;
    }

    function login($users_login, $users_pass)
    {
        if (!empty($users_login) AND !empty($users_pass)) {
        $users_pass2 = md5($users_pass);
            $count = mysql_num_rows(mysql_query("SELECT * FROM users WHERE users_login='$users_login' AND users_pass='$users_pass2'"));
            if ($count == '1') {
                $_SESSION['users_login'] = $users_login;
                $_SESSION['users_pass'] = md5($users_pass);
                return true;
            } else {
                return false;
            }
        }else{
            return false;
        }
    }