What are the best tutorial videos to learn just Javascript?

I have seen a large collection of different tutorial videos now that have all been very helpful.

I was wondering if there was any videos on simply understanding Javascript rather than anything else (just focusing on scripting for beginners up to the more advanced Javascripting).

Thanks for your help!

http://www.unity3dstudent.com/ is what I did. It's very simple and the scripting starts off nice and easy. Plus, they often post the code along with the video.