6 random numbers without repeat

Question

I'm trying to make a 6 digit random number generator between 1 and 48. When the user click a button 6 random numbers show up in 6 different textFeilds. The problem is that I don't want the same number twice. How can I generate 6 different random numbers without using return and breaking out of the function?
import flash.events.Event;
stop();
btn.addEventListener (MouseEvent.CLICK, random1);
function random1 (evt:Event) {
          display1.text = "";
          display2.text = "";
          display3.text = "";
          display4.text = "";
          display5.text = "";
          display6.text = "";
          var r1 = Math.floor(Math.random()*(1+48-1))+1;
          var r2 = Math.floor(Math.random()*(1+48-1))+1;
          var r3 = Math.floor(Math.random()*(1+48-1))+1;
          var r4 = Math.floor(Math.random()*(1+48-1))+1;
          var r5 = Math.floor(Math.random()*(1+48-1))+1;
          var r6 = Math.floor(Math.random()*(1+48-1))+1;
          if (r2 == r1 || r3 == r2 || r4 == r3 || r5 == r4 || r6 == r5) {
                    return;
          var liste:Array = new Array();
          liste.push(r1,r2,r3,r4,r5,r6);
          liste.sort(Array.NUMERIC);
          display1.text = String(liste[0]);
          display2.text = String(liste[1]);
          display3.text = String(liste[2]);
          display4.text = String(liste[3]);
          display5.text = String(liste[4]);
          display6.text = String(liste[5]);

Answer 1

Here's the code for the approach mentioned with your textfields included
btn.addEventListener (MouseEvent.CLICK, random1);
function random1 (evt:Event) {
    var nums:Array = new Array();
    // fill the array of numbers
    for(var i:uint=1; i<=48; i++){
        nums.push(i);
    shuffle(nums);
    // grab the first six in the shuffled array
    var liste:Array = nums.splice(0,6);
    // assign the values to the textfields
    for(var j:uint=1; j<=6; j++){
        this["display"+String(j)].text = String(liste[j]);
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;