Error in createTimeline.js


I'm working with the timeline plug in, and finding it works pretty well. However!

I can't get it to display the timeline in Chrome -- only Firefox and Opera so far (no access to IE at the moment).

FF and Opera just display the page as expected with no errors in the console.

Chrome, however, reports "Uncaught ReferenceError: Timeline is not defined" and points to line 11 in createTimeline.js.

Any ideas?

Thanks in advance.

A bit more info that may be useful:

I'm building this inside of a SimplePage, and here's the code I'm using:

$items = get_items(array('collection' => '6'), 0);

<div id="timeline" style="height:350px;"> </div>
<?php createTimeline('timeline', $items ); ?>