怎样使flash的背景变成透明的？

<EMBED src="Movie2.swf" quality=high wmode=transparent bgcolor=#FFFFFF 
WIDTH=550  HEIGHT=400 TYPE="application/x-shockwave-flash"
 PLUGINSPAGE="http://www.macromedia.com/shockwave/
download/index.cgi?P1_Prod_Version =ShockwaveFlash"></EMBED>
加上红色字体的属性即可！