(partially flash related) Positioning help!

Hello. Again. I was wondering if anybody knows how, or has access to a tutorial on positioning your flash movie on the internet after you’ve published it to a html. When I open the html link, its all very left aligned, which I’m not liking, and I was wondering how would you go about positioning your movie like on home star runner (centered window with black background and the like).
On the topic of this, i’ll add a previous post which went relatively unanswered. How do you change the actionscript so that the “getURL” comand does not open up a separate browser and instead just loads the information up on the smae page as the link? Sorry If i haven’t made this cler, and any help would be gretly appreciated.
Thanks ants. Thants.