Flash cs3 and php problem (system error)

Question

Hi All,
Been checking out a free utility, called Tell A Friend - followed the instructions to a t but still getting system error.
Here is the php code:
<?php
$to = ($_POST['friend']);
$link = ($_POST['link']);
$subject = "Tell a friend";
$message = "Your friend ";
$message .= $_POST['name'] . " wants advice you the following link: ".$link;
$headers = "My WebSite Name";
if(@mail($to, $subject, $message, $headers))
echo "answer=ok";
else
echo "answer=error";
?>
The main swf has a main.as attached:
* Flash Tell A Friend
* http://www.FlepStudio.org        
* Author: Filippo Lughi          
* version 1.0                      
package
import flash.display.*;
import flash.events.*;
import flash.utils.*;
import flash.external.*;
import flash.net.*;
public class main extends MovieClip
  private const PHP_URL:String="sendMail.php";
  private var checker:CheckEmail;
  private var timer:Timer;
  public function main()
   addEventListener(Event.ADDED_TO_STAGE,init);
  private function init(evt:Event):void
   removeEventListener(Event.ADDED_TO_STAGE,init);
   stage.frameRate=31;
   checker= new CheckEmail();
   addInputListener();
   addSendListener();
  private function addInputListener():void
   clip_mc.name_txt.background=true;
   clip_mc.name_txt.backgroundColor=0x999999;
   clip_mc.name_txt.addEventListener(FocusEvent.FOCUS_IN,onFocusIn);
   clip_mc.name_txt.addEventListener(FocusEvent.FOCUS_OUT,onFocusOut);
   clip_mc.email_txt.background=true;
   clip_mc.email_txt.backgroundColor=0x999999;
   clip_mc.email_txt.addEventListener(FocusEvent.FOCUS_IN,onFocusIn);
   clip_mc.email_txt.addEventListener(FocusEvent.FOCUS_OUT,onFocusOut);
  private function onFocusIn(evt:Event):void
   evt.target.background=true;
   evt.target.backgroundColor=0xFFFFFF;
  private function onFocusOut(evt:Event):void
   evt.target.backgroundColor=0x999999;
  private function addSendListener():void
   clip_mc.send_mc.mouseChildren=false;
   clip_mc.send_mc.buttonMode=true;
   clip_mc.send_mc.addEventListener(MouseEvent.MOUSE_DOWN,onSendDown);
  private function onSendDown(evt:MouseEvent):void
   if(clip_mc.name_txt.text!="")
    if(checker.initCheck(clip_mc.email_txt.text))
     sendEmail();
    else
     displayPhrase("Invalid Email");
   else
    displayPhrase("Invalid name");
  private function sendEmail():void
   clip_mc.send_mc.mouseEnabled=false;
   var variables:URLVariables=new URLVariables();
   variables.name=clip_mc.name_txt.text;
   variables.friend=clip_mc.email_txt.text;
   variables.link=ExternalInterface.call('window.location.href.toString');
   var request:URLRequest=new URLRequest();
   request.url=PHP_URL;
   request.method=URLRequestMethod.POST;
   request.data=variables;
   var loader:URLLoader=new URLLoader();
   loader.dataFormat=URLLoaderDataFormat.VARIABLES;
   loader.addEventListener(Event.COMPLETE,onMessageSent);
   try
    loader.load(request);
   catch (error:Error)
    trace('Unable to load the document.');
  private function onMessageSent(evt:Event):void
   var vars:URLVariables=new URLVariables(evt.target.data);
   if(vars.answer=='ok')
    displayPhrase("Message Sent!");
   else
    displayPhrase("System Error!");
   clip_mc.send_mc.mouseEnabled=true;
   clip_mc.name_txt.text="";
   clip_mc.email_txt.text="";
  private function displayPhrase(s:String):void
   clip_mc.display_txt.text=s;
   resetPhrase();
  private function resetPhrase():void
   timer=new Timer(1500,1);
   timer.addEventListener(TimerEvent.TIMER,hidePhrase);
   timer.start();
  private function hidePhrase(evt:TimerEvent):void
   clip_mc.display_txt.text="";
Any help appreciated. This is a great viral marketing tool, when it ever works
Kind Regards,
Boxing Boom

Answer 1

Never seen such an error, but if it's in the status bar of the browser then it shouldn't be Flash problem. You can check what's happening in your swf by creating a dynamic text field and setting it's text in every major action, that is: requesting PHP and getting back response, to what's just happened.
So, on the Flash side you can see whether the browser error stops the PHP script and immobilizes further actions.
What I'd do is create a new Flash file and PHP file and just send 1 variable to PHP, change it somehow and send it back to Flash and print it in a text field. That way you can check whether it's the method you're using to request PHP or just PHP or something else. Step by step adding complexity and checking on which of these steps the error occurs.
I wish you good luck.
Ps. It's probably a very rookie problem, we just don't know the source.