I had 200 good natural links to my site from different sites and site ranked great for my keywords. Somebody (I suppose my competitor who is angry at me but doesn't matter) has hacked other sites 2 days ago (checked Google cache) and now Yahoo Site Explorer shows 1100 backlinks. I've checked new links - they all are in the same hidden div block - top:-150px; position:absolute;. I'm afraid that Google may penalize my site for these links. I'm contacting webmasters of these sites so they remove these links. Is it possible to give Google a notice that these links are not mine so it could just skip them not penalizing me?