I recommend going out and buying the third edition of [Programming in Lua](http://www.amazon.com/exec/obidos/ASIN/859037985X/lua-pilind...), then using that to learn Lua before getting into JavaScript.

PiL will present examples that will change the way you think in several different ways, which you will then be able to leverage in any other programming language (most of the time, depending on how restrictive the language is).