用中文搜索这方面的内容，无非设置z-index，没有什么有价值的东西。

转用英文在google上搜索：menu over flash on IE and firefox
终于找到了解决Flash覆盖下拉导航菜单的解决方法：

Just registered because of this thread.

Weve had the exact same problem and this thread helped us fix it.

It worked fine in IE, but not in Firefox, so we added the above suggestion and it worked in firefox but not IE, so, we merged the IE solution with the Firefox solution and it works in both. Doesnt work properly in Opera, but then again, what does?

For information, heres the code we used:

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="1002" height="300">  
    <param name="movie" value="banner.swf" />  
    <param name="wmode" value="transparent">  
    <param wmode="transparent">    
    <param name="quality" value="high" />  
    <param name="bgcolor" value="#E0F8E2">    
    <embed wmode="transparent" src="banner.swf" bgcolor="#E0F8E2" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="1002" height="300"></embed>  
</object>