Including non CodeIgniter scripts

[eluser]PHP Creative[/eluser]
This is the code in question - http://msteigerwalt.com/widgets/ratings/v1.2/

A PHP Error was encountered
Severity: Notice

Message: Undefined index: vote

Filename: CodeIgniter_1.7.1/ratings.php

Line Number: 247

Code:

if ($_POST['vote'] && $_POST['id']) {
    $r = new RabidRatings();
    $r->doVote($_POST['id'], $_POST['vote']);
};

The error comes from this section ratings.php (above).

I am simply including demo.php into a view.