Including javascript in headinclude?

[glorify]

To date I have been more of a designer than a coder but I am working on something that's fairly nice.

It's a marquee, (yes another), that uses a js file from dynamic drive. Please see my site for the demo. You can change direction, pause, speed up, etc all by mouse over. Really smooth motion and highly configurable via the admincp.

Anyway, I have to place this in the headinclude template:

<script type="text/javascript" src="crawler.js">
/*
Text and/or Image Crawler Script ?2009 John Davenport Scheuer
as first seen in http://www.dynamicdrive.com/forums/ username: jscheuer1
This Notice Must Remain for Legal Use
*/
</script>

And if I release this as a mod, I don't want to have people do a template edit. Very basic I am sure, but have no clue what plugin code to write for my xml.

[Dismounted]

You can add and modify the $headinclude variable (which is the headinclude template), at global_setup_complete.