Checkbox values not adding up correctly

1

Dont know what i did or am doing wrong!
i also tried with leaving the == true off - adds to zero
The code files are at
http://teachingbytechnology.com/finalgame/

New Code



substance.text = myVars.substance;
sum.text= myVars.sum;
score.text = Score;
var atoms:Number = 0;
var ions:Number = 0;
var compound:Number = 0;
var molecule:Number = 0;
var element:Number = O;
//var sum2:Number = 0;
count = 0;

function CreateAnswers() {
if (cb_ionic_compound.selected == true)
 ions = 6;
if (cb_compounds.selected == true)
 compound = 2;
if (cb_molecule.selected == true)
 molecule = 3;
if (cb_element1.selected == true)
 element = 4;
if (cb_atom.selected == true)
 atoms = 5;
 
var sum2 = ions + compound + molecule + element + atoms;
}