How to compare value of two Combo Box

Question

I've two Combo Box(cbFirst & cbSecond). I want to compare the value that has been selected by the user and based on the result, output is displayed. In both Combo Box I've provided the value.
Here is my code:
var a:Number;
var b:Number;
function First(evt:Event):void{
    a = evt.target.value;
    trace(a);   
cbFirst.addEventListener(Event.CHANGE, First);
function Second(evt:Event):void{
    b = evt.target.value;
    trace(b);
cbSecond.addEventListener(Event.CHANGE, Second);
If (a > b){
     trace("a is greater")
else
     trace(b is greater);
The trace statement inside the functions are working fine and the correct value of a & b is printed. But the comparison in the if statement doesn't seem to work. Could you please help me out.

Answer 1

there's a typo.  fix it or remove it:
var a:Number;
var b:Number;
function First(evt:Event):void{
    a = evt.target.value;
trace(a);
   compareF();
cbFirst.addEventListener(Event.CHANGE, First);
function Second(evt:Event):void{
    b = evt.target.value;
    trace(b);
compareF()
cbSecond.addEventListener(Event.CHANGE, Second);
function compareF(){
If (a > b){
     trace("a is greater")
else
     trace(b is greater);