Flash movie autoplays although autoplay button is unchecked

<embed height="300" width="400" play="false" src="http://www.mydomain.com/userfiles/flash/Missoula-3min.swf" type="application/x-shockwave-flash" loop="false" menu="true" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed>