High quality embed codes (added &ap=%2526fmt%3D18 to the end of the urls):
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320 x 265 (small):

<object width="320" height="265"><param name="movie" value="http://www.youtube.com/v/ymOtmXF0Nlw&hl=de&fs=1&ap=%2526fmt%3D18"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/ymOtmXF0Nlw&hl=de&fs=1&ap=%2526fmt%3D18" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="320" height="265"></embed></object>



425 x 344 (standard):

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/ymOtmXF0Nlw&hl=de&fs=1&ap=%2526fmt%3D18"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/ymOtmXF0Nlw&hl=de&fs=1&ap=%2526fmt%3D18" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>