I just started remaking my first flash site and I got a new free host… I learned the html to show my Swf. on the page aswell ( which I’m pretty proud of, since I’ve only been using flash a week now)… But As you can probably tell it hangs to the left of the screen…
I know that some/a lot of the stuff on this site, http://www.htmlgoodies.com is/may be out of date, but I know that it helped me a bit back in the day. I also know that this might not be the best way to do this either, css probably being your better bet, but, anyways, something like this should work.
What Jdl said, its easy and its not being lazy, the end result is more important. Import the swf file into Dreamweaver by clicking the red flash icon, locate it> when its on the page, on down to the properties window>select it and center it.