I got your code to work correctly, following EvanK's suggestion of placing the javascript in a /js/ directory (relative to the web Home dir), and prefixing "/js/":

print '<script type="text/javascript" src="/js/wz_jsgraphics.js"></scr
+ipt>';
[download]

Please note : There seems to be an updated, and better documented version of the javascript at the author (Balamurugan S)'s website (http://www.sbmkpm.com/).