if (count($errors) == 0) {
  	//$password = md5($password);
  	$query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
  	$result = mysqli_query($db, $query);
  	if (mysqli_num_rows($result) == 1) {
  	  $_SESSION['username'] = $username;
  	  $_SESSION['success'] = "You are now logged in";
  	  header('location: index.php');
  	}else {
  		array_push($errors, "Wrong username/password combination");
			echo '<script language="javascript">';
			echo 'alert("Wrong username/password combination")';
			echo '</script>';
  	}
  }
}