让flash在最底层显示

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0" width="885" height="187">
      <param name="movie" value="fla/topflash.swf">
      <param name="quality" value="high">
      <param name="wmode" value="opaque">
      <embed src="fla/topflash.swf" width="885" height="187" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" wmode="opaque"></embed>
    </object>

加入参数：  <param name="wmode" value="opaque">