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We have implemented something similar in the past with no negative effects. Same deal with tabbed content. If this type of display is convenient for the user and not only served to search engines then you're within the search engine guidelines. Even if you do get in trouble (very unlikely) there is always a re-inclusion request in which you can explain things to Google. One thing to keep in mind is Google's cloaking filter they've been writing about this recently as they start to compare what is displayed to them to what user would see. I cannot know exactly to what extent the site may vary in appearance with your overlay feature. Visit: Google Webmaster Tools > Labs > Instant Previews See the last paragraph in the attached image. dejan-seo-preview.PNG