How do I Modify YouTube bbcode code to play youtube HD?


Hi guys, I'm Looking for a way to modify my YouTube bbcode code so to embed youtube at HD quality.
Here's my youtube BB Code I'm using at present.

Admin CP -> Home -> BB Code Media Sites -> YouTube

Match URLs:{$id}{$id}{$id}*/u/*/{$id}{$id}

Embed HTML:
<div align="center"><iframe width="640" height="360" src="{$id}?wmode=opaque" frameborder="0" allowfullscreen></iframe></div>

Any help on this would be great.