this is taken from Elizabeth Castro's great book 'HTML for the WWW'
To scale a QT movie
<param name="scale" value="factor" /> (the /> is for xhtml to be accepted as validated code. if you're not bothering with validated code you can get away with just >, but having read this book, validated xhtml is beneficial in the long term in terms of having sites compatable with cross platform browser advances )
where factor is either:
tofit (to fit it's box)
aspect (fit box but maintain original proportions)
n (n=number you wish to scale it by, ie: 2 for double size)
In the embed section, add the parameter scale="value" (where value is whatever you chose in the <param> tag.
as a note for validation: xhtml doesn't validate the <embed> tag, so i removed it, and the file still plays in IE6 and NN7. I've posted to see if anyone knows of any issues with doing this, but again if you don't care about validating your text, then use the <embed> tag.
hope this helps.