Both errors are from the same script, but the second error was on a line I wrote while trying to fix the error. I am used to C#, not JS but thought variable declarations were the same. (From looking at the rest of the script) Adding var before the i worked! Thanks. There are a few other errors that I will try to solve now.

Just changed it to no longer be strict and all my errors went away. Has something changed in the strictness? Because that code used to work...

Yep, as far as i remember they made some more things strict, but as i said i don't use UnityScript so i can't really tell ;)

Variable declarations looks different than in C#:

// Dynamically typed var (very slow due to needed typecasting)
var myVar;

// statically typed var
var myVar : int;
var myVar : GameObject;

// also statically typed due to type-inference
var myVar = 5;  // type will be "int"
var myMesh = new Mesh(); // type will be "Mesh"

Ah, thanks, that helps heaps. I don't think I'll use strict though :D

NVM, just read: "The benefits are improved error checking and more efficient code generation leading to faster execution times"