Proper way to scale assets for multiple devices

I am working on an ActionScript Mobile app which I intend to build for iphone 3gs, iPhone 4 and iPad 1&2.
What is the correct way to scale assets such as background images so that I may be able to use the same graphical assets for all of the mobile devices above?
Using AIR 2.7 and in my app descriptor file I have specified "cpu" for renderMode and "true" for fullScreen. From what I have read, the fullscreen bug in AIR 2.7 is only present when using gpu as the rendermode w/ fullscreen, so I don't think that is what is going on.
I have a background image which is supposed to fill up the entire screen for all devices. This image is in a swc file and has these dimensions: 960 x 640
In my main class I have included the following:
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
When I test on iPhone 4, it looks fine and fills up the entire screen as expected. When I test on iPad 1, the image is not wide enough and is a bit too short. Shouldn't the following code force the background image to fill the entire screen regardless of device?
backgroundImage.width = stage.stageWidth;
backgroundImage.height = stage.stageHeight;
Instead, it makes the backgound really small in the upper left hand corner for all devices. Can someone shed some light here? I am stumped.
Hopefully I am doing someone stupid and it is an easy fix..Thanks!

Here is what I have been doing. Do what you did by scaling the stage to the top left and fill the entire screen.
Now set up an onEnterFrame event to give your background image dimensions. Since you want one image to work for all the devices it has to be an image that works even if part of it is not showing so design with that in mind.
So lets say your image is iPad screen size 768 wide x 1024 tall. I pad is a 3/4 screen ration so 3 wide by 4 tall in proportion.
Set up a variable that measures the screen ratio, so something like
var frameRatio = stage.stageWidth / stage.stageHeight;
this will return a result of 0.75 or 3/4
Now since you know this you can set up an if else statemenet (excuse my sloppy code, do not copy paste)
if (frameRatio >= 0.75)
backgroundImage.height = stage.stageHeight;
backgroundImage.scaleX = backgroundImage.scaleY <------ this will scale the image proportionally to match the height.
else if (frameRatio < 0.75)
backgroundImage.wdith = stage.stageWidth; <------ notice if its less than .75 we now make the image first fill the stage to the stage's width
backgroundImage.scaleY = backgroundImage.scaleX <---- notice these are flipped so now we proportionally scale the height based on the width
This works well for me even with orientation changes. Its easiest to set you background image point of refrence to the center and then orient it by simply dividing the stageWidth and stageHeight by 2 for the x and the y values respectively.
Let me know if that helped at all I can post an actual line of code if need be.

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dragondriver wrote:
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