that is all configurable in the regex and resulting code

regex:
Code
(|.*v=)([a-zA-Z0-9_-]{8,12})(|&.*)
handles both a URL and naked ID, because the 'v=' is captured as option.. and then the 2nd capture grabs the all important number wink

markup:
HTML
<center><object width="630" height="380">
  <param value="http://www.youtube.com/v/\\2&fs=1&ap=%2526fmt%3D22" name="movie" />
  <param value="window" name="wmode" />
  <param value="true" name="allowFullScreen" />
  <param name="allowscriptaccess" value="always">
  <embed width="630" height="380" wmode="window" allowfullscreen="true" type="application/x-shockwave-flash" allowscriptaccess="always" src="http://www.youtube.com/v/\\2&fs=1&ap=%2526fmt%3D22">
  </embed>
</object></center>
the markup just adds <center> tags as a quicky to center it..

addionally, i enable hiDef in this markup and a fullscreen button...

you might decide to change the height/width to something smaller instead wink

note: i know i'd supplied these regexes to Rick (minus hidef) when 7.3.1 came out.. musta been lost in the shuffle..