如何让遮罩层悬浮在object标签中

最近使用Flex做了一个图片预览的功能，想要实现当检测所选图片有效性时在整个页面出现一个遮罩层（使用了Jquery的mask插件）以使用户不能再进行其它操作（尤其是提交表单的操作），顺着这个思路把代码写好后测试时发现在其它浏览器中都好用，可是在IE浏览器中就不好用——object标签区域遮罩层不好使，代码如下：

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
	id="tempPictureUpload" width="150" height="188"
	codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab">
	<param name="movie" value="<%=basePath %>js/previewPicture/previewPicture.swf" />
	<param name="quality" value="high" />
	<param name="bgcolor" value="#ffffff" />
	<param name="allowScriptAccess" value="sameDomain" />
	<param name="flashVars" value="saveTempPictureURL=<%=basePath %>" />

	<embed name="tempPictureUpload" src="<%=basePath %>js/previewPicture/previewPicture.swf"
	       quality="high" bgcolor="#869ca7" width="210" height="144" align="middle"
	       play="true" loop="false" allowScriptAccess="sameDomain" type="application/x-shockwave-flash"
	       flashVars="saveTempPictureURL=<%=basePath %>SaveTempPictureServlet"
	       pluginspage="http://www.adobe.com/go/getflashplayer">
	</embed>
</object>

通过网络终于找到了解决问题的方法——在object标签中添加<param name="wmode" value="transparent">即可，修改后的代码如下：

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
	id="tempPictureUpload" width="150" height="188"
	codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab">
	<param name="movie" value="<%=basePath %>js/previewPicture/previewPicture.swf" />
	<param name="quality" value="high" />
	<param name="bgcolor" value="#ffffff" />
	<param name="allowScriptAccess" value="sameDomain" />
	<param name="wmode" value="transparent">
	<param name="flashVars" value="saveTempPictureURL=<%=basePath %>" />

	<embed name="tempPictureUpload" src="<%=basePath %>js/previewPicture/previewPicture.swf"
	       quality="high" bgcolor="#869ca7" width="210" height="144" align="middle"
	       play="true" loop="false" allowScriptAccess="sameDomain" type="application/x-shockwave-flash"
	       flashVars="saveTempPictureURL=<%=basePath %>SaveTempPictureServlet"
	       pluginspage="http://www.adobe.com/go/getflashplayer">
	</embed>
</object>