If you don't want people to grab your images, DON'T PUT THEM ON GOOGLE. I'm sure you're desperate for clicks, but if I see the image do this when I hover over it (with HoverZoom) then I'm not using your website to go get it, because at least 75% of the time, I can find exactly the same image somewhere else without your bullshit.
Same resolution and everything. So get over yourselves. If you're that keen then throw a watermark on there somewhere subtle.