ExternalInterface.available returns false on a Mac

programming flash
1

Hi there!

I’m triyng to get the browsers back-button to work with my flash site. The general principle is this:
There is an index.html page containing an (not yet) hidden Iframe and the flash movie.
The Iframe contains page A, which starts with JavaScript calling a BACK-function on the index-page.
The BACK-function triggers an AS-function in the flash-movie that activates its own back-button, and then changes the URL of the Iframe to Page B. This causes a new History to be added to the browser.

The flash movie now contains 5 frames (labeled in the middle of the stage) and two navigation buttons: back (Terug) and forward (Verder). Those buttons do exactly what you’d expect them to do (prevFrame and nextFrame).

On a PC (IE) this seems to work pretty well. But on a mac nothing seems to work propperly.
I’ve got a testpage at: [COLOR=#800080]http://www.multimediamatters.nl/test[/COLOR]
Here’s the code I have on the first frame.
*
stop();

_root.terug.onRelease = function(){
prevFrame();
}

terugF = function(){
trace(_root._currentframe);
if (_root._currentframe > 1){
_root.terug.onRelease();
}
else {
_root.getURL(“javascript::history.go(-2)”);
}
}

import flash.external.*;

var isAvailable:Boolean = ExternalInterface.available;

var txtField2:TextField = this.createTextField(“txtField”, this.getNextHighestDepth(), 300, 0, 200, 50);
txtField2.border = true;
txtField2.text = "ExternalInterface.available = "+isAvailable.toString();

var methodName:String = “goHome”;
var instance:Object = null;
var method:Function = terugF;
var wasSuccessful:Boolean = ExternalInterface.addCallback(methodName, instance, method);

var txtField:TextField = this.createTextField(“txtField”, this.getNextHighestDepth(), 0, 0, 200, 50);
txtField.border = true;
txtField.text = "ExternalInterface.addCallback = "+wasSuccessful.toString();*

Somehow the ExternalInterface doesn’t seem to get loaded. Any suggestions to solve this?
Thanks in advance.

Yours,
Andra

P.S.
The condition if (_root._currentframe > 1){ doesn’t work on a PC either. It always calls _root.terug.onRelease(). I can’t figure out why…