As well as the custom set-up parameters and event data, Tinderbox's HTML Timeline uses a custom JavaScript library to create and draw the timeline. The library is accessed at http://www.eastgate.com/Tinderbox/js/timelines.js
However, the library can be downloaded and used either for local offline use or to allow further customisation. In such scenarios remember to correct the HTML <script> tag path to point to the local resource.
The library defines the timeline object.
The library is still regarded at this point as being experimental and is thus liable to further change (or even withdrawal).