floating sidebar widget for wordpress website

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Job Description

i want to copy the floating sidebar widget as seen here: http://www.quicksprout.com/2013/02/07/how-i-grew-quick-sprout-from-121311-to-244923-readers-in-30-days/

As you scroll down the green ad follows you

and heres a long post on my site: http://www.secretentourage.com/entrepreneur/51-apps-entrepreneurs-cant-live-without/

let me know if you can do it and what it would take