Board Thread:General Discussion/@comment-10732926-20130717172852/@comment-2200849-20130720192950

It is possible using Javascript. Keep in mind that those lacking a Flash plugin, such as Adobe Flash Player or Gnash, won't be able to view Flash files.

I placed the code at https://gist.github.com/TK-999/6046161 ; copy it into MediaWiki:Common.js on your wiki and you're set.