Switch google adsense ad (mobile vs regular) based on user agent

I'm optimizing a site so that on a mobile browser it only shows the mobile adsense ad, and on desktop it only shows the regular one. Problem is the google code leaves a white space where these ads are on 开发者_JS百科the page.

I want to know if there is an easy way to programmatically insert the ad (JS) based on the user agent.

Thanks.

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It's very simple, see Masquerading Your Browser for details on how the User-Agent header works. See also the HTTP specification.

You haven't said which server side language you're using. In PHP you would look at the value of $_SERVER['HTTP_USER_AGENT'].