Javascript factory pattern variable scoping

I am following a tutorial that is showing the factory pattern to create objects in javascript. The following code has me stumped as to why it works. 6-2.htm the first commented line seems proper to me (using the `this` keyword in the showLabel function). i'm not sure how using obj in its place is working. obj would have to reference a global variable somewhere because within that function when its run there is no obj defined, right? since i make 2 objects, its not just luck in this case that both get displayed fine, the older values for obj's contents are stored and referenced properly. but how? if i uncomment the second comment then it breaks and i understand why, now im explicitly telling js that i'm talking about a local variable and there is none.

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