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Are layers OK With SEO?
This is going to ba a 200 plus page site, and I would hate to use layers if it is going to mess up SEO.
There will be 4 layers and no overlapping (all will be visible)
Will G like it? who cares..........
Seriously if the content is there their bot will pick it up and use it.
Divs, not tables, are the way forward.
Layers are in fact easier for seo than tables as you can choose what they see first.
Make sure your layer with the most relevant content is presented first, it may have its content given more weight by search engines