Best adsense search box placement according to you...

Which one do you think is the best placement for an adsense search box from the following -

1- Right at the top of the page
2- At the end of the page and the article
3- At the end of the left navigation menu

I would say depends on the design of your site.
I saw a proxy site recently that placed the google search box in sucg a place that you automatically go to put your url in thinking its the proxy url box...Clever!!!

I think its on the right side or after an article so your visitors after reading your article might search for more info on what they have read.