as3 ExternalInterface.addCallback is not working right

document.observe('dom:loaded', function() {
    		$('episode1').observe('click', function() {
    			var params = {wmode : "transparent", allowScriptAccess:"always", movie:"header"};
    			swfobject.embedSWF("swf/float.swf", "header", "100%", "100%", "9.0.0","expressInstall.swf", "", params, "");
    			sendToActionScript("ep1.swf");

    		});
    	})
function thisMovie(movieName) {

    		 if (navigator.appName.indexOf("Microsoft") != -1) {
    			 return window[movieName];
    		 } else {
    		 //alert("aaa")
    			 return document[movieName];
    		 }
        }
function sendToActionScript(value) {
    		thisMovie('header').sendToActionScript(value);
    	 }

private function receivedFromJavaScript(value:String):void {

    		loader.load(new URLRequest(value));

        }

var timeoutId;
var js_initiate_callback = function() {
	// This is the swf object:
	fvar_js.js_to_as_f();
	clearTimeout ( timeoutId );
}
var reset_fvar_f = function(new_val) {
	fvar_val = new_val;
}
//js_initiate_callback();
timeoutId = setTimeout(js_initiate_callback, 1000);

function GetSWF(strName) {

        if (window.document[strName] != null)
            if (window.document[strName].length == null)
                return window.document[strName];
            else
                return window.document[strName][1];
        else
            if (document[strName].length == null)
                return document[strName];
            else
                return document[strName][1];

 }

function GetSWF(strName) {

        if (window.document[strName] != null)
            if (window.document[strName].length == null)
                return window.document[strName];
            else
                return window.document[strName][1];
        else
            if (document[strName].length == null)
                return document[strName];
            else
                return document[strName][1];

    }