Suzanne,
I'm guessing that you are actually trying to enable Java. Javascript is a scripting language that is supported by K-Meleon and doesn't require any additional downloads. Although it shares the same name, they are actually 2 completely different things. Confusing, huh?
You shouldn't have to move any files into the plugin folder as K-Meleon will auto-detect the JRE installation. You don't need to change the "Identify Browser as" setting in the Privacy section. The default is "Default" even though it doesn't show up that way. I realize now that the documentation might make that a little confusing. I'll revise that to make it more clear.
See the following in the Release Notes about Java:
http://kmeleon.sourceforge.net/docs/relnotes05.php#install
Test with about:plugins to see if it is properly detecting your JRE installation.
If you still have questions, please e-mail me. My e-mail is available under Help - About K-Meleon.
Andrew Mutch