CSO SiteAd tag and extension
From MediaWiki.org
The CSO_SiteAd tag and extension allows you to put ads—forms, Javascript, HTML—safely inside a <CSO_SiteAd> tag for use on your MediaWiki pages. It can handle Google AdSense, PayPal, and most other types of advertisements. CSO_SiteAd has two levels of security—the page must be protected and the site ad id must be known to the CSO_SiteAd extension.
CSO_SiteAd tag usage example:
<CSO_SiteAd>PayPal</CSO_SiteAd>
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