first one: seems pretty logical.
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/0WelbyPJAIo&hl=nl&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/0WelbyPJAIo&hl=nl&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
2nd one (I dont know if annonations work when you post vids here, otherwise you have to speak german to understand this

)
<object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/e6Ao0wYlBZI&hl=nl&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/e6Ao0wYlBZI&hl=nl&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object>
3rd one. hmm....
<object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/M6u-NpK0-xo&hl=nl&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/M6u-NpK0-xo&hl=nl&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object>