Flash in IE vs. Firefox


I’m not sure whether this belongs here or in the Web Design forum, but I’m hoping there is an easy coding fix…

I uploaded a flash site, but it looks completely different in Firefox and IE. I want the Flash to be 960x540, centered on the page, with a little space on all sides (padding or margin, I always confuse them). It looks good in Firefox, but when I view it in IE it goes longer than the page so you have to scroll, and everything just takes up too much space.