Displaying 3 random and unique numbers out of 6

Question

The following program gives me the results in the output panel because I used trace.  The problem is that I want these numbers displayed when I click on a button.  The numbers should not duplicate when the button is clicked, for example not "3, 3, 2" but "3, 2, 5".  Here is the program that randomly selects numbers (which by the way is not mine):   (I'll happily donate 15$ to the animal charity of your choice for whoever can give me a hand with this problem, thanks!)
var mynumbers:Array = ["1","2","3","4","5","6"];
var mystuff:Array = [];
var randomCount:Number = 3;
var r:Number;
for (var i = 0; i<randomCount; i++)
r = Math.floor(Math.random() * mynumbers.length);
mystuff[mystuff.length] = mynumbers.splice(r,1);
trace(mystuff);
//and here is my button code
generate_btn.addEventListener(MouseEvent.CLICK, coco);
//3.;
function coco(event:MouseEvent):void

Answer 1

Hi
I am trying to replace the numbers in the random script with pictures. I thought that all I had to do was replace the numbers in the array with pictures name.
I am getting the output as picture names instead of actual images. I just started flash a few weeks ago and would appreciate where I am going wrong in the code below. I know, it's a bit ambitious for someone who has no experience in programming or mathematical background. I think, that is the only way to learn. By asking the experts in programming. Otherwise, I just give up, and go back to watching TV.
var mynumbers:Array = ["alfa.jpg","beta.jpg","alfa1.jpg","alfa2.jpg","alfa3.jpg","alfa4.jpg"];
var randomCount:Number = 3;
function shuffle(a:Array) {
    var p:int;
    var t:*;
    var ivar:int;
    for (ivar = a.length-1; ivar>=0; ivar--) {
        p=Math.floor((ivar+1)*Math.random());
        t = a[ivar];
        a[ivar] = a[p];
        a[p] = t;
//and here is my button code
generate_btn.addEventListener(MouseEvent.CLICK, coco);
//3.;
function coco(event:MouseEvent):void
shuffle(mynumbers);
for(var i:int=0;i<randomCount;i++){
if(!this["tf_"+i]){
this["tf_"+i]=new TextField();
this["tf_"+i].text = mynumbers[i];
addChild(this["tf_"+i]);
this["tf_"+i].y = i*40;