Need script

Hi,

From my experience Yahoo Ads provides more revenue than Google Adsese. At the same time Yahoo works only in US not on other countries and doesn't pays well.

So, my requirement is to show yahoo ads on my websites only for US visitors and for others I want to show Google Adsense Ads.

Can somebody provide me a script for my requirement?

Any help would be greatly appreciated.

Thanks in advance.

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