Anyone know how I can get the code for pop-up bookmark

Today I saw on a webpage when I was trying to leave asks " Bookmark us" in a pop up window.

Here is a screen shot of what I saw. I really like this and would like to add it.

Any clue

2012-09-15_1402.png · 20.4K · 512 views
Quote · 15 Sep 2012
 
 
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