如何从javascript调用flash actionscript回调方法？

// Flash ActionScript
function callFromJavaScript():void {
    // 在这里编写你的回调方法
}
ExternalInterface.addCallback("callFromJavaScript", callFromJavaScript);

   <param name="movie" value="path/to/your/flash.swf">
   <param name="allowScriptAccess" value="always">
   <embed src="path/to/your/flash.swf" width="800" height="600" name="myFlash" allowScriptAccess="always" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer">
</object>

// JavaScript
function callFlashFunction() {
    var flashObject = document.getElementById("myFlash");
    if (flashObject.callFromJavaScript) {
        flashObject.callFromJavaScript();
    } else {
        alert("Flash function not found.");
    }
}