设置flash置底，加个代码：<param name="wmode" value="opaque" />但是只加这个代码，IE可行，在FF下，失效。要想在FF下起作用，还要用在object 里加个 wmode="opaque" ，12实例代码如下：
<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="560" height="210">
<param name="movie" value="http://www.konnech.cn/2/images/banner.swf" />
<param name="quality" value="high" />
<param name="wmode" value="opaque">
<embed src="http://www.konnech.cn/2/images/banner.swf" wmode="opaque" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="560" height="210"></embed>
</object>
