设置flash的object的wmode为transparent就好了：
<OBJECT?
codeBase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0"?classid=clsid:D27CDB6E-AE6D-11cf-96B8-444553540000?width=536?height=260>
<PARAM?NAME="wmode"?VALUE="transparent">
<PARAM?NAME="Movie"?VALUE="flash路径">
<embed?src="flash路 径"?quality="high"?pluginspage="http://www.macromedia.com/go/getflashplayer"?type="application/x-shockwave-flash"?width="536"?height="260"?wmode="transparent"></embed></OBJECT>
<PARAM?NAME="wmode"?VALUE="transparent">
<PARAM?NAME="Movie"?VALUE="flash路径">
<embed?src="flash路 径"?quality="high"?pluginspage="http://www.macromedia.com/go/getflashplayer"?type="application/x-shockwave-flash"?width="536"?height="260"?wmode="transparent"></embed></OBJECT>