Need help on creating a flash landingpage that is browser friendly (AS2)

Hi, I’m doing a project for a client:
I’m creating a landing page(*.php) with flash swf content. I click into a flash banner from a website and some values are transported to this landingpage and into the flash swf with Flashvars.

How do I do the landing page *swf so that:
*the content will be visible in most webbrowsers (resolution of screen, and browser client)
*content will be centered
*when I maximize the webbrowser, the content of the landingpage should be in centered and keep the same size
*And should have a preloader so the content loads relative fast

I’m not a professional user of flash, but I know how to send and recieve variables into flash. It’s important for the content to look good in different browsers and is centered.

I give an example of banner+landningpage:
[COLOR=#22229c]http://www.narsell.se/Sofia/exempel3/index.html[/COLOR]

Please give me some direction!
Actionscript 2, Flash CS3 (published flash 8 and above)
The project must be finished at the end of this week