Showing Become a fan button in Custom FBML Facebook App

Want to add Become a fan button of my custom Facebook application on FBML Canvas page. In facebook Developer WIKI i found this, If you want to render a Fan Box on an FBML canvas page, use fb:iframe and reference the Fan Box as per the instructions on the Fan Box page. I just want so sample code to see how it can be done.

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moiz_kiyaniAuthor Commented:
The solution to this I found is:

<fb:iframe scrolling="no" frameborder="0" src= "<?=$app_id?>">
            <fb:fan profile_id="<?=$app_id?>"></fb:fan>

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