[Solved] Duplicate Content?

With FURLS enabled I get the nice URLS I want, but still the pages with site.com/index.php?id=10 at the end are still accessible. What is the best way to deal with this since search engines dont like duplicate content?

here you go - SEO Strict URLs plugin
http://modxcms.com/forums/index.php/topic,12452.0.html
http://modxcms.com/extras/package/?package=395

thanks agn sir