You can't. Facebook will not allow javascript postings.

Unless something has changed since, June 20th, 2007

See this post from zdnet:
http://blogs.zdnet.com/social/?p=215

"The opportunity to monetize applications was a result of Facebook’s decision to allow developers to display unlimited advertisements. On par with advertising as a source of income, some developers, like myself, have come to prefer the use of affiliate links (finding leads for eBay, Amazon, etc) instead. Part of the reason is that Facebook does not allow developers to embed JavaScript within their code; hence making it difficult to enable Google Adsense for the content. Moreover, as is the case with MySpace, contextual advertising is not targeted enough to earn sizable revenues."

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