Image Update via CSV import

Question

I am running Magento 1.8.1.0 Community and have over 700 simple products that need images assigned to them. These images are already assigned and uploaded to the configurable products.

I have done a catalog export and made a new sheet with only one product (config & simple) on it, copied image paths into the proper places, but when I do the import nothing has changed.

Google Docs - Click this to see what I am working with

I've seen articles about this being possible but can't seem to get it working for myself. Any help is appreciated.