How can I call Flash function using JavaScript?

[forsiam]

I've seen the example in
http://www.thescripts.com/forum/thread694359.html

but I still have problem about javascript. (I use SWFObject)

My Action Script

import flash.external.ExternalInterface;
 
 
var success:Boolean = ExternalInterface.addCallback("thisMethod",this, test);
 
function test(){
    displayTxt.text = "OK";
}
 

My Javascript & HTML

<script type="text/javascript" src="swfobject.js"></script>
<SCRIPT LANGUAGE="JavaScript">
<!--
function pause()
{
    var flash = document.getElementById("mymovie");
    flash.thisMethod();
}
 
//-->
</SCRIPT>
 
<div id="flashcontent">This text is replaced by the Flash movie.</div>
 
<script type="text/javascript">
   var so = new SWFObject("test.swf", "mymovie", "200", "80", "8");
   so.addParam("flashvars", "filename=music.mp3");
   so.addParam("allowScriptAccess", "always");
   so.write("flashcontent");
</script>
 
<INPUT TYPE="button" value="Pause" onclick="pause()">
 

have anything wrong? thank you