adding a exit popup to my site

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I want a popup when someone exists by site making them a coupon offer if they contact right then. So when they exit from any page it pops up a small box that says something and then has a contact form with a coupon code line as well as our number. The popup should be simular to the help tab popup that occurs when you click the get help button on the side of our site currently.

Skills required:
Graphic Design, HTML, PHP, Website Design
About the employer:
Public Clarification Board
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