Topic: Thumbs and Images in Same folder

I just bought the simple viewer not long ago and have been trying to figure one thing out.

How to get SV to work when images and thumbnails are in the same folder

I have seen how you can put thumbnails and images in the same folder and just put something in the XML and change the script to look for that thumbnail.

Is there a way to do it WITHOUT having to put another XML line in. For instance all my images are named
Image01, Image02
with the thumbs the same name with a _sml at the end, named
Image01_sml, Image02_sml

Is there a way to change the code to know that the thumbnails are the same with a _sml at the end. It would save me from having to move thousands of images around.
Thanks in advnace for any help