I was wondering if there was a way to remove the watermark from certain images?

I have a category that's laid out differently using CSS than all other product categories. The products under this category will have 2 large images - the second is an "additional image". It's about 550px in width, and to get it to show up on the page, I had to name it the same name as the product image + _01_LRG. When I did that, the image showed up as it should - but here's a watermark over it. It also has the script with the hover attribute added to that image.

So I'm wondering if there's a way to remove the script and watermark from additional images in a particular category? I'm not afraid to hack code if I must - but I'd need to know where to look for it. Any help would be appreciated.