some videos are not working with Knoppix 5 + an old Flash player so it's better to use a Knoppix 6 at least - download the Flash player on the Adobe.com (.tar.gz) and uncompress it - create a "plugins" directory in your ~/.mozilla - copy the libflashlayer.so you got in the archive into this plugins directory - then sudo cp -r usr/* /usr with Chromium/Knoppix 7, it's even easier