Health & Money Variable in Game

Question

Hi,
I'm working on a game where I need to have a variable for money and a variable for Health, or in my case, I call it Energy. Most tutorials I'm finding are in AS2 and the AS3 ones are not this basic thing that I need. Basically, I have an item shop with a pizza button, and in their respective dynamic text fields, you can see the status of your Energy and your Money. So, let's say the person clicks the pizza to buy it, Flash will subtract 10 (for 10 bucks) from the person's total money value and add 15 for total Energy points.
This is what I've written so far and I'm writing all the script in Flash, not outside using classes or packages. I can tell already that I'm missing something. How do I write it so that Flash knows to add 15 Energy from that Pizza button and can I update the values of the variables and kick off that mouse event in the same function? What am I missing?
var money:Number=0;
var energy:Number=0;
stat_money.text="10"; //FOR TESTING PURPOSES, I put it so that you have 10 bucks and 80 Energy so I can see that it works when I click the pizza
stat_energy.text="80";
pizza_button.addEventListener(MouseEvent.DOUBLE_CLICK, pizzaUpdate);
function pizzaUpdate(evt:MouseEvent):void
    energy+=value;
    stat_energy.text=String(energy);
    money-=value;
    stat_money.text=String(energy);
Any help would be greatly appreciated!

Answer 1

OMG IT WORKS! Thanks. It seems like I had a typo with the strings on the bottom. On what I copied and pasted, I put them as both energy and not one as money. And it seems you added just this:
pizza_button.doubleClickEnabled = true;
Would you mind explaining how and why this works with what I already had? Would I always just write it:
buttonInstance_here.eventTypeEnabled = true (or false);
I just want to make sure so I can learn how to write these things from scratch rather than copying and pasting from a source and not actually knowing how it all works. Thank you so much!