[istanbul]

<object width="425" height="355">
<param name="movie" value="http://www.youtube.com/v/65_S-5GB_aw">
</param>
<param name="wmode" value="transparent">
</param>
<embed src="http://www.youtube.com/v/65_S-5GB_aw" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed>
</object>

These are normal Embed Codes of Youtube if you add &autoplay=1 text at the end of this code your videos will start automaticly..
Here is code which i added for you

<object width="425" height="355">
<param name="movie" value="http://www.youtube.com/v/65_S-5GB_aw">
</param>
<param name="wmode" value="transparent">
</param>
<embed src="http://www.youtube.com/v/65_S-5GB_aw&autoplay=1" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed>
</object>

ALSO :
autoplay=1&rel=0 <---- If u you dont want to show related videos that text works fine

Someone may need it..