var width = screen.width;
var height = screen.height;

if(width <= 1024 && height <= 768){
	document.write('<link rel="stylesheet" type="text/css" href="css/screen_1024.css" />');
}

if(width >= 1280 && height >= 1024){
	document.write('<link rel="stylesheet" type="text/css" href="css/screen_1280.css" />');
}