Embed:

<object width="640" height="480"><param name="movie" value="http://www.youtube.com/v/z25t-PQDn5A&rel=1&border=0"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/z25t-PQDn5A&rel=1&border=0" type="application/x-shockwave-flash" wmode="transparent"width="640" height="480"></embed></object>