I don't fully understand the question... but I think the answer is probably to add a class to elements you want to change at a particular break-point and then use that class to display or not in the media query.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.