function admin() {
	define ('REALM','Minu admin');
	define ('USERNAME', 'admin');
	//echo md5('test123');
	define ('PASSWORD', 'cc03e747a6afbbcbf8be7668acfebee5'); //md5 hash
	define ('LOGIN_ERROR', 'Viga!');
	if (!isset($_SERVER)) {
		global $HTTP_SERVER_VARS;
		$_SERVER = $HTTP_SERVER_VARS;
	}

	if (!isset($_SERVER['PHP_AUTH_USER']) or empty($_SERVER['PHP_AUTH_USER'])) { 
		header('WWW-Authenticate: Basic realm="'.REALM.'"'); 
		header('HTTP/1.0 401 Unauthorized'); 
		echo LOGIN_ERROR; 
		exit;
	}
	if (isset($_SERVER['PHP_AUTH_USER']) and !empty($_SERVER['PHP_AUTH_USER'])) {
		if ($_SERVER['PHP_AUTH_USER']!= USERNAME or md5($_SERVER['PHP_AUTH_PW'])!= PASSWORD) { 
			header('WWW-Authenticate: Basic realm="'.REALM.'"'); 
			header('HTTP/1.0 401 Unauthorized'); 
			echo LOGIN_ERROR;
			exit;
		}
		else {
			define('IS_ADMIN', true);
		}
	}
	else {
		define ('IS_ADMIN', false);
	}
}

admin();