How do I reference the following for a secure connection?

How do I reference the following for a secure connection?

The following is a javascript file that I need held under a secure connection for when a customer is making a purchase on my site.

http://cachedcommons.org/cache/jquery-jcarousel/0.2.5/javascripts/jquery-jcarousel.js

How can I get this referenced under a secure connections?

Thanks people