function returnWidth(){

	var margin = 20 * 2;
	var scrollbarWidth = 20;
	var minWidth = 800 - (scrollbarWidth * 2) - margin; //minWidth = 720
	var maxWidth = 1024 - (scrollbarWidth * 2) - margin; //maxWidth = 944
	var shellWidth = document.body.clientWidth - scrollbarWidth - margin;

	if(shellWidth <= minWidth){
		return minWidth + "px";
	} else if(shellWidth >= maxWidth){
		return maxWidth + "px";
	} else {
		return "100%";
	}

}