Since s9y's default quicksearch plug-in indexes only the default language, Korean versions of the pages were mostly ignored. But because Google indexes the website every couple of days, including the Korean pages, I've decided to make the Google search function into a plug-in. It appears in the sidebar looking like the quicksearch, but the search results page is generated by Google. For best results and functionality, it is recommended to be used with a Google AdSense account.
Google Quicksearch plug-in is downloadable at SourceForge CVS.