&autoplay=1 eklemen yeterli olur.
Ornek;
<object width="425" height="355">
<param name="movie" value="http://www.youtube.com/v/CrGdhrq12CM&hl=en
&autoplay=1">
</param><param name="wmode" value="transparent"></param>
<embed src="http://www.youtube.com/v/CrGdhrq12CM&hl=en
&autoplay=1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355">
</embed></object>