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My client just tasked me with helping create a great Amazon listing for their product. I know nothing about selling on Amazon. Which guides/books/tips should I check out?

The developers want to use hidden divs to display links to each page of our photo gallery from the first page to Google but only previous and next buttons to users. Will this be a problem? Is it the best solution?

Two sites. One has weaker sales. What would the benefits and problems for SEO of moving the weak site from its own domain to a subdomain of the stronger site?