Modify javascript image fader rotater to scale images

The files are attached. This script is working perfectly. I just want it modified to so the images will scale when the browser is resized smaller. I want to be able to set image size by percentage of the that holds it. The result will be scalability for desktop browser windows as well as mobile devices. I am able to do this now in the body of the page by setting the image size as a percentage, but the javascript as it is seems to demand a size from the code that is static. I have tried using percentages instead of whole numbers, but when I do this, it doesn't display any images.