Authorization-form
It's authorization form, login button handler and login to your personal account, logout button
Each file is:
header.php - html-file for links "Главная", "Регистрация", "Вход", "Выход", and links to handlers, respectively.
aut.php - error and success messages + autentification form.
index.php - main content
dbconnect.php - database connection
autentification.php - processing of data, entered by the user and reconciliation of the entered data with data from the database
captcha.php - generates a captcha and displays an image