Ok, not a very blackhat question but still. Whats your take on this, what will big G think: - Whenever a user visits a "subpage" on my site they are redirected to the index page. This would happen just if the referrer was an SE, and of course not if the user went from the index to a subpage. I believe I have seen many ecommerce sites etc doing this. So would google penalize me for this?