Greetings, Karibu.

IIRC, a standard initial install of IceWeasel in Knoppix 6.7.1 includes an
enabled java-script blocker, NoScript, or something like that.

IceWeasel>Tools>Add-Ons>Extensions>Disable is one way to turn this off, thereby
enabling java-script execution. There is likely a panel icon that would serve as well.

Also, a browser with an enabled javascript-blocker will interact with the Knoppix.net
forum editor in weird & wonderful ways. You might find it easier to compose off-line
with gedit or leafpad to avoid this hassle. As an alternative, with AdBlock you can
dis-engage the blocker on any given url if you so choose.
Some of us prefer AdBlock-Plus to NoScript.