Thanks for the help lads.
Just one of those things where I'd rather people NOT pinch my images, (yes, despite them being ONLY Harris', Matty!!!), but it affects my entire gallary site, so ANYTHING I upload, including Trade Bait, box breaks, etc, etc, they all get watermarked.
If I can do my bit to stop people from using others' images on ebay, then I think it's a start.