Java ExternalInterface doesn't communicate with swf in Firefox & Safari

programming flash
1

I have two swf files: swf_sender and swf_receiver. The swf_sender controls the swf_receiver via java script.
Everything works fine in IE however, the swf_receiver doesn’t receive communication from java script if openned by Safari or Firefox.
The first part of communication: swf_sender - Java works ok (I tested it with alert() in Java) in all browsers.

Here is my Java interface code:

 
<script type="text/javascript">
 function getFlashMovie(movieName) {
  var isIE = navigator.appName.indexOf("Microsoft") != -1;
  return (isIE) ? window[movieName] : document[movieName];
 }
// call the sendTextToFlash function in AS3
 getFlashMovie("FlashName").sendTextToFlash("40");
</script>

Here is my AS3 code in swf_receiver:


import flash.external.ExternalInterface;
function getTextFromJavaScript(FrameNumber:String):void {
 gotoAndPlay(FrameNumber);
}
ExternalInterface.addCallback("sendTextToFlash", getTextFromJavaScript);

I’d greatly appreciate any advice/ideas…