Dreamweaver and Flash?

I’ve got a Flash file that I want to embed into an HTML pages via Dreamweaver. I’ve figured out how to do this but the Flash stuff always seems to be alligned right on the window.

If I wanted it to be be centralised within a set boundary size (ie 750x600 or something) would I need to do a style sheet for it or something? I’m very new to coding so I’m not too sure how to make it work ^^;;

Anyone got any pointers/advice?