@DFPHOTO, I am also a photographer and I also show on my site the difference BEFORE and AFTER a correction of a photo.
I find Will Woodgate’s stack (ImageCompare) absolutely perfect for that (much better than a standard rollover) – and the stack is free. It is also easy to implement. The product page contains enough information for using the stack – even for relative beginners.
All stacks that Will sells can be downloaded as demos for you to evaluate. He has a comprehensive Knowledge Base and instructions on his site. And he is tireless when it comes to helping users of his products.
Since you are a newcomer to Rapid Weaver, you may or may not realize that in order to use 3rd party stacks, you need to start with purchasing and installing the ‘Stacks’ plugin from YourHead Software. That plugin will enable you to use many different stacks from many developers, to extend and expand capabilities of Rapid Weaver.