How do I get the background of flash player to be transparent

I dont know much about how the flash object works , but I am embedding a video in Dreamweaver ,and there is a white background on the background.

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="360" height="2开发者_如何学Go40" id="FLVPlayer">
  <param name="movie" value="FLVPlayer_Progressive.swf" />
  <param name="quality" value="high" />
  <param name="wmode" value="opaque" />
  <param name="scale" value="noscale" />
  <param name="salign" value="lt" />

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Set the wmode property to transparent.

However, be sure to test it. From Adobe Support:

Not every web browser handles transparency in the same way. Be sure to test your SWF file in all browsers that you want to enable your audience to use. Most Linux browsers do not support Flash transparency. This table lists several browsers that support transparency.