Floating div in table

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Bids
4
Avg Bid (USD)
$22
Project Budget (USD)
$10 - $30

Project Description:
I need a simple script that will allow an adsense skyscraper ad to display in a html table so that when the visitor scrolls down the page the skyscraper ad will stop at the top of the page while the content in the other column continues to scroll. An example can be found at the following link

http://www.dafont.com/

The skyscraper is on the left side below the Dafont logo and once scrolled down only the skyscraper ad remains viewed, I'm looking for the exact same results.

Skills required:
Javascript, PHP
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