Trying to convert as1 code to as3

Question

Hi,
I have to convert a as1 site to as3.
The only part of the whole thing that i'm not sure of is this:
          on(release){
                    loadvariables ("save.aspx?cmd=addemail&adresse=" add string(adresse.text),this)    
                    Object.prototype.alert = function (message) {
                          getURL("javascript:alert('"+message+"')");
               alert("We received your email, thank you.");
               adresse.text="";
It's basically a newsletter subscription box done in as1.
Will the same code work if I only include it in a as3 MouseEvent.CLICK like this:
function btn_click(event:MouseEvent):void {
          loadvariables ("save.aspx?cmd=addemail&adresse=" add string(adresse.text),this)    
          Object.prototype.alert = function (message) {
                getURL("javascript:alert('"+message+"')");
     alert("We received your email, thank you.");
     adresse.text="";
Thanks

Answer 1

Thanks Ned for guiding me.
I looked into both (URLLoader / ExternalInterface) and I came up converting the original As1 code:
on(release){
loadvariables ("save.aspx?cmd=addemail&adresse=" add string(Adresse.text),this)    
Object.prototype.alert = function (message) {
getURL("javascript:alert('"+message+"')");
alert("We received your email, thank you.");
Adresse.text="";
into this As3 code:
lbl.text = "ExternalInterface.available: " + ExternalInterface.available;
var myLoader:URLLoader;
var myVars:URLVariables;
var Response:String = "We received your email, thank you.";
//////////////////////////////////////////////////////////////////////////////This is my button
button.enabled = ExternalInterface.available;
button.addEventListener(MouseEvent.CLICK, sendEmail);
/////////////////////////////////////////////////////////////////////This is Onclick
function sendEmail(e:MouseEvent):void
    myLoader = new URLLoader();
    myVars = new URLVariables();
    myLoader.dataFormat = URLLoaderDataFormat.VARIABLES;
    myVars.email = Adresse.text; // Text from textfield
    myLoader.data = myVars;
    myLoader.addEventListener(Event.COMPLETE, messageSent, false, 0, true);
    myLoader.load(new URLRequest("save.aspx?cmd=addemail&adresse="+myVars.email));
///////////////////////////////////////////////////////////////This is the response
function messageSent(e:Event):void
    ExternalInterface.call("alert", Response);
    Adresse.text="";
The thing is that I don't have access to the server and aspx file and i'd just like to make sure i'm heading in the right direction so far.