show image of the link on mouse over

This specific to the messages posted by members for various sections on this forum.
when I read through the message text, and if the member has typed in some link of other site, on mouse over of this link i see small image of the link contents.
I wanted to know how to do that
Are the images stored in the database and shown on mouse over or its something else.

Posted On: Monday 26th of November 2012 10:09:35 PM Total Views:  506
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