How to avoid caching of css, images, javascript...

I'm writing a new portal component for the portal which utilizes some images and javascript. unfortunately, I need to make changes to the javascript already deployed as part of the component. My changes are deployed as part of the par file (I can see the change when I browse the deployment), but when accessing the script via the web browser, I see the original code. No matter what I do, I can't seem to flush the cache to get the portal to present the new files.

Any suggestions? I've tried searching SDN, but search appears to be broken at the moment.

And, before anyone suggests it, I don't have access to the file system on which the portal is running, so I can't manually remove the files.