I know basic html and that's it. It's a start I guess but ?I have a long way to go.
Javascript is how almost all content rich website are built these days. So it's linked very, very closely to HTML and CSS (among other things).
If you want a simple place to start learning JS (and this is way outside the scope of the jam), i suggest you check out http://www.w3schools.com/js/default.asp