package
{
    import flash.external.*
    import flash.net.*;
    import flash.display.*;
    import flash.system.System;
    public class ext_test extends Sprite {
    function ext_test():void {
        ExternalInterface.marshallExceptions = true;
        ExternalInterface.addCallback("g", g);

        try {
        ExternalInterface.call("throwit");
        } catch(e:Error) {
        trace(e)
        }
    }
    function g() { throw new Error("exception from actionscript!!!!") }
    }
}

//
// Requires:
//   - A Flash Professional Label component on the Stage with an instance name of "lbl".
//   - A Flash Professional Button component on the Stage with an instance name of "button".
//
var xmlResponse:String = "<invoke name=\"isReady\" returntype=\"xml\"><arguments><number>1</number><number>" + stage.stageWidth + "</number><number>" + stage.stageHeight + "</number></arguments></invoke>";
 
lbl.text = "ExternalInterface.available: " + ExternalInterface.available;
lbl.width = 200;
button.enabled = ExternalInterface.available;
button.addEventListener(MouseEvent.CLICK, button_click);
 
function button_click(evt:MouseEvent):void {
    ExternalInterface.call("alert", xmlResponse);
}

package  {
    
    import flash.display.Sprite;
    import flash.events.*;
    import flash.external.ExternalInterface;
    import flash.text.TextField;
    import flash.utils.Timer;
    import flash.text.TextFieldType;
    import flash.text.TextFieldAutoSize;
    import flash.system.Security;
	
	public class ExternalInterfaceExample extends Sprite 
	{
		
	private var input:TextField;
        private var output:TextField;
        private var sendBtn:Sprite;
		
		public function ExternalInterfaceExample() 
		{
			// constructor code
			Security.allowDomain("*");
			
			
			input = new TextField();
            input.type = TextFieldType.INPUT;
            input.background = true;
            input.border = true;
            input.width = 350;
            input.height = 18;
            addChild(input);

            sendBtn = new Sprite();
            sendBtn.mouseEnabled = true;
            sendBtn.x = input.width + 10;
            sendBtn.graphics.beginFill(0xcccccc);
            sendBtn.graphics.drawRoundRect(0, 0, 80, 18, 10, 10);
            sendBtn.graphics.endFill();
            sendBtn.addEventListener(MouseEvent.CLICK, clickHandler);
            addChild(sendBtn);

            output = new TextField();
            output.y = 25;
            output.width = 450;
            output.height = 325;
            output.multiline = true;
            output.wordWrap = true;
            output.border = true;
            output.text = "Initializing...\n";
            addChild(output);
			
			
            if (ExternalInterface.available) {
                try {
                    output.appendText("Adding callback...\n");
                    ExternalInterface.addCallback("sendToActionScript", receivedFromJavaScript);
                    if (checkJavaScriptReady()) {
                        output.appendText("JavaScript is ready.\n");
                    } else {
                        output.appendText("JavaScript is not ready, creating timer.\n");
                        var readyTimer:Timer = new Timer(100, 0);
                        readyTimer.addEventListener(TimerEvent.TIMER, timerHandler);
                        readyTimer.start();
                    }
                } catch (error:SecurityError) {
                    output.appendText("A SecurityError occurred: " + error.message + "\n");
                } catch (error:Error) {
                    output.appendText("An Error occurred: " + error.message + "\n");
                }
            } else {
                output.appendText("External interface is not available for this container.");
            }
        }
        private function receivedFromJavaScript(value:String):void {
            output.appendText("JavaScript says: " + value + "\n");
        }
        private function checkJavaScriptReady():Boolean {
            var isReady:Boolean = ExternalInterface.call("isReady");
            return isReady;
        }
        private function timerHandler(event:TimerEvent):void {
            output.appendText("Checking JavaScript status...\n");
            var isReady:Boolean = checkJavaScriptReady();
            if (isReady) {
                output.appendText("JavaScript is ready.\n");
				output.appendText("ExternalInterface.objectID = " + ExternalInterface.objectID + "\n");
                Timer(event.target).stop();
            }
        }
        private function clickHandler(event:MouseEvent):void {
            if (ExternalInterface.available) {
                ExternalInterface.call("sendToJavaScript", input.text);
            }
        }
    }
}

  <!-- saved from url=(0014)about:internet -->
  <html lang="en">
  <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>ExternalInterfaceExample</title>
  <script language="JavaScript">
      var jsReady = false;
      function isReady() {
          return jsReady;
      }
      function pageInit() {
          jsReady = true;
          document.forms["form1"].output.value += "\n" + "JavaScript is ready.\n";
      }
      function sendToActionScript(value) {
        document.getElementById("ExternalInterfaceExample").sendToActionScript(value);
      }
      function sendToJavaScript(value) {
          document.forms["form1"].output.value += "ActionScript says: " + value + "\n";
      }
  </script>
  </head>
  <body onload="pageInit();">
  
   <object id="ExternalInterfaceExample"  name="ExternalInterfaceExample" 
   type="application/x-shockwave-flash" data="ExternalInterfaceExample.swf" width="550" height="400">
     <param name="movie" value="ExternalInterfaceExample.swf"/>
     <param name="quality" value="high"/>
     <param name="allowscriptaccess" value="always"/>
     <a href="http://www.adobe.com/go/getflash">
         <img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player"/>
     </a>
   </object>
  
      <form name="form1" onsubmit="return false;">
          <input type="text" name="input" value="" />
          <input type="button" value="Send" onclick="sendToActionScript(this.form.input.value);" /><br />
          <textarea cols="60" rows="20" name="output" readonly="true">Initializing...</textarea>
      </form>
  
  </body>
  </html>