Java Script : How To Show different content to search engine visitors

Perhaps, you face a task to show slightly different information to different website visitors. For instance, you can show different content to the regular visitors and those who visit a website for the first time.
We must say this task is already implemented in the WordPress plugin What Would Seth Godin Do. We decided to address this issue in a different way by implementing a generic JavaScript solution.

So, on some website there is HTML documentation for a software product. Among other purposes such documentation should attract search engines visitors. To tell the truth, the visitors coming from search engines do not stay too long at a website. Finding the answer to their question, such visitors quickly leave the site even not remember what product they've seen. It is a good deal to show them a tempting offer to download something.  more...