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javascript question: functionName.VariableName?

I had the following question in a test today. But i had not see something like functionName.VariableName before. Not sure how that works.

Would be great if you can tell me the solution:

function Item(itemName)
{
 var next_item_id = 1;
 Item.item_name = itemName;
 Item.item_id = next_item_id++;
}
var Item1 = Item('Desktop');
var Item2 = Item('Laptop');
var Item3 = Item('Monitor');
  1. Anything wrong with the code above? if yes fix it. (The problem i would see is next_item_id is always 1, need to make it global?)
  2. Modify the function so that the variable "next_item_id", cannot be modified during run time.
  3. My own question, how does the variable like Item.item_name work? I want to google it, but not sure what I should search for.

Thanks.

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    +1, This is the only correct answer given. It appears everyone else wanted to "solve" the test question instead of answering the OP's actual question. Commented Sep 11, 2011 at 15:04

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