How do I accommodate larger screens?

I'm using the "@media screen and (max-width: 480px) {" approach to my stylesheets for the different sized mobile devices I expect to hit my site.

I'm building the needed "landscape / portrait" graphics to accommodate the following dimensions:

320 / 480
480 / 800
800 / 1280

My concern is that I see several sizes of screen resolutions that don't necessarily "fit" into my collection of six graphics and I want to know if there's a way I can tweak my "@media screen" syntax so that a mobile device with a screen resolution of 540 / 960 will still be accommodated by my 800 / 1280 setting, even though the dimensions aren't referenced specifically.

It may be that's already being addressed and I just don't have enough of an understanding of the code. It just seems like there's been times I've been in development mode on my desktop and unless I got rid of the "@media screen" dynamics within my css, because my desktop screen was larger than anything referenced by my stylesheet, I didn't get any kind of stylesheet at all.

So, how do I craft my stylesheet so I can be certain that all my user's screen sizes are being accommodated?
Bruce GustPHP DeveloperAsked:
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Dave BaldwinFixer of ProblemsCommented:
Why don't you just test those modes?  Chrome and Firefox both have 'mobi' modes with different resolutions available.  Opera has their Mobile Emulator too.
RobOwner (Aidellio)Commented:
That's why i use bootstrap ( so that it does all that hard work.  With images you can set the width to 100% (of its container) and height to auto and it will resize no matter what the screensize (

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