When you're on youtube, under the 'Video Description' section there will be a box that says 'Embed'. Copy all that text from there, and paste it in here!
Eg.
Which produces:
Eg.
- Code:
<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/Rx0DHVB2mNo&hl=en"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/Rx0DHVB2mNo&hl=en" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>
Which produces:
