Demos
For these to work, you will have to open your "Java configuration panel" (Oracle Java plugin control panel), go to the security tab, set the security level from "very high" to "high" and add "http://www.madkit.net" to the exception list.
These do not work for now with the icedtea plugin from open-jdk.
Alternatively, all these demos are available in the demos folder of MaDKit-5 releases.