You can make your flash object fluid by providing a % width via CSS. Unfortunately it does have one problem, you need to provide the flash object with both a width and height to keep it proportional.
However it is not impossible, go to my blog, a couple of posts
http://nickcowie.com/2006/the-fluid-elastic-reboot/ and http://nickcowie.com/2006/flash-and-the-fluid-elastic-design/
give some details of the techniques I used to get the header image which is a 4k flash file to stretch and remain in the right proportions. You can resize the browser window from 600px to 4000+px wide and the header graphic will fill the width of the whole browser window.
_javascript_ is used to do the scaling and to insert the flash over alternative content (for non js or non flash browsers) and of course there is the flashblock plugin. But for me flash is the only way to put scalable vector images into today's browsers.
As you are using pure vector images in flash they will scale to any size. As I have tested my header to over 4000px wide and it scales fine. Note my choice of font, does cause some odd looks at certain widths.
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Nick Cowie
http://nickcowie.com
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