I remember seeing one some time ago but I cannot find now and googling is hard with these terms.
You could try http://amberjack2.org/. However the Library is not documented yet. You'll have to look at the source to see how to implement it.
Just found another library which appears to be easier: http://tympanus.net/Development/WebsiteTour/
Here are posts that talks about it:
PS: I would definitely not use that on a serious page ;)
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