that is all configurable in the regex and resulting code
regex:
(|.*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
markup:
<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
note: i know i'd supplied these regexes to Rick (minus hidef) when 7.3.1 came out.. musta been lost in the shuffle..