If the police subpeona the ISP then you're probably cooked but that would only come with alot more than picture from a website, they'ed have to have other evidence to go with it. For all of my internet activities I use peerguardian2 for surfing, not only does it block all known goverment ip but also it blocks third party companies that are paid to find copyright violators, its completly free from methlabs software.