[mickknutson]

I actually found the solution:

<div style="float:left;margin:0 10px 5px 0;"><object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/{param}"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/{param}" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object></div>

However, I want to add an optional option {option} for justifying left or right.

By default, it would be nice to justify left, but allow to override to justify right with the {option} tag.

How do I accomplish this? where {option} defaults to left. but can be set to right

<div style="float:{option};margin:0 10px 5px 0;"><object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/{param}"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/{param}" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object></div>

example uses:

Default:

[youtube]n20K3-AEOPY[/youtube]

With optional justification:

[youtube=left]n20K3-AEOPY[/youtube]