if(isset($_COOKIE['login']) and isset($_COOKIE['pass'])){
	$info = mysqli_query($db,"SELECT * FROM `users` WHERE `login` = '$_COOKIE[login]' and `password` = '$_COOKIE[pass]'");
	$arr = mysqli_fetch_array($info);
	echo $arr["nick"].'<form method="POST" action="exit.php">
		  <input type="submit" name="exit" value="Выход"/>
		  </form>';
}else{
	echo '<input type="text" id="a_login" placeholder=" Логин"/><br/>
		  <input type="password" id="a_password" placeholder=" Пароль"/><br/>
		  <button id="btn">Вход</button><a href="reg.php">Регистрация</a><br/>
		  <font id="alert" color="red"></font>';
}