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[编程] Javascript 向Flash发送消息时报错了..

function getFlashMovie(movieName) {
       var isIE = navigator.appName.indexOf("Microsoft") != -1;
       return (isIE) ? window[movieName] : document[movieName];
}
function formSend() {
       var text = document.htmlForm.sendField.value;
       getFlashMovie("ExternalInterfaceExample").sendTextToFlash(text);
}

浏览器错误提示:sendTextToFlash is not a function;
请问sendTextToFlash应该写在html的哪个位置?

AS的代码:
import flash.external.ExternalInterface;
function getTextFromJavaScript(str:String):Void {
received_ti.text = "From JavaScript: " + str;
}
ExternalInterface.addCallback("sendTextToFlash", this, getTextFromJavaScript);