Create a file in your wiki home like so
wikisearch.xml
<SearchPlugin xmlns=”http://www.mozilla.org/2006/browser/search/” xmlns:os=”http://a9.com/-/spec/opensearch/1.1/”>
<os:ShortName>Your Wiki</os:ShortName>
<os:Description>Your Wiki</os:Description>
<os:InputEncoding>UTF-8</os:InputEncoding>
<os:Url type=”text/html” method=”GET”
template=”http://wiki.yourcompany.com/mediawiki/index.php/Special:Search?search={searchTerms}”>
</os:Url>
</SearchPlugin>
Ensure the os:Url matches your install.
in your mediawiki/skins/ directory add
<link title=”Your Wiki” type=”application/opensearchdescription+xml” rel=”search” href=”http://wiki.yourcompany.com/wikisearch.xml” />
into MonoBook.tpl & Monobook.php inside the <head> element.
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