Need easy to understand way to center youtube embedded in wordpress

Hello,

Two questions:

[1] Everytime i need to embed a youtube video, i need to check off "Disable the visual editor when writing" under profile...is that true?

[2] How to center the youtube videos.

If this is the code :

<object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/anBRO5C2WBY&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/anBRO5C2WBY&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object>

how to modify it to center it?

thanks