Untitled

<?php
session_start();
if(isset($_SESSION["admin"])){
	header("Location: admin.php");
}
if(isset($_POST["submit"])){
	if(empty($_POST["username"])){
		echo 'Username required';
	}
	if(empty($_POST["password"])){
		echo 'Password required';
	}
	$username = $_POST["username"];
	$password = $_POST["password"];

	if(file_exists("users/".$username.".txt")){
		$file = "users/". $username .".txt";
		$password = 'password';
	} else {
		echo 'You are not the admin of this site';
	}
}
?>
<!DOCTYPE html>
<html>
<head>
<title>BukkitPE Login Page</title>
<style type="text/css">
a{
	text-decoration:none;
}
</style>
</head>
<body>

<nav><font size="3"><a href="index.php">Home</a></font></nav><br><br>

<fieldset style="width:30%"><legend>Login</legend>
<form action="login.php" method="post">
	<label for="username">Name:</label><br>
	<input type="text" name="username" /><br>
	<label for="password">Password:</label><br>
	<input type="password" name="password" /><br>
	<input type="submit" value="Submit" name="submit"/>
</form>
</fieldset>
</center>
</body>
</html>