innerHTML在Firefox和IE中不起作用

我有一种感觉,我在这里错过了一些简单的东西,但似乎无法找到它.

我正在使用SwfUpload,在其uploadSuccess()事件中,我在屏幕上显示"成功"消息,同时隐藏进度图像.以下是片段:

swfu.uploadSuccess = function(file, serverData, response) {
    document.getElementById("progressImg").display = "none";

    var uploadMessage = document.getElementById("UploadMessage");
    uploadMessage.style.display = "block";
    uploadMessage.innerHTML("The file, " + file.name + ", was uploaded successfully.");                 
};

当我试图设置uploadMessage对象的文本时,一切正常,直到最后一行.该对象指的是一个标签,虽然我也试过它

 uploadMessage.innerHTML = "...";