Swfobject: place swf inside a container

Hi…

Does anyone know how I can use SWFobject to place a SWF inside a container?

I am using SWFobject to make the width and height 100% so that it takes the entire browser screen.
However, I want my swf to stay within a horizontal border (so that it takes up say 100% height and 90% width). But, even if I place the flashcontent div (that I target with SWFobject) within another container div (which I only target with CSS, with 90% width and center it). The SWF file will take up the whole page, going over the margins of the container div.

Thanks