product counter
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I would like to make (probably is javascript or jquery the best for that) a counter which would show how many products are the still available.

The counter would not represent the true number of products in stock. I would like that when visitor will come to the site he will see "Only 9 products left", and when will he be on the site for- lets say- 20 seconds, the timer/counter will say "Only 8 products left" and so on.

Is there any wordpress plugin for that? Or some source code? Thanks.