What is the best way to load a common Javascript chunk of code from a file on a simple website? I need to add a script that tracks users for the Piwiki Open Source Analytics. I have hardly worked with Javascript, and just wanted to know what should I do?
<!-- Piwik -->
blah blah blah
<!-- End Piwik Tag -->
Basically, I don't want to have to update the entire site if I make a change.