<embed> attributes to stop auto-resizing?

Hey all. For anyone familiar with Facebook’s “Share” functionality, you might understand what I’m asking.

My flash player is being auto-resized to 350px wide by Facebook. I’m trying to figure out a way to stop it from being auto-resized. Can anybody recommend an attribute to the <embed> tag to stop it from auto-scaling/resizing?

Also a note: I can’t use the <object> tag because Facebook won’t let you. It has to be the <embed> tag.

Thanks!