var viewportwidth;
var viewportheight;
 
// Mozilla / Netscape / Opera / IE7
if (typeof window.innerWidth != 'undefined') {
	viewportwidth = window.innerWidth,
	viewportheight = window.innerHeight
}
 
// IE6
else if (typeof document.documentElement != 'undefined'
	&& typeof document.documentElement.clientWidth !=
	'undefined' && document.documentElement.clientWidth != 0) {
	viewportwidth = document.documentElement.clientWidth,
	viewportheight = document.documentElement.clientHeight
}
 
// IE
else {
	viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
	viewportheight = document.getElementsByTagName('body')[0].clientHeight
}

// document.write('<p>Your viewport width is '+viewportwidth+'x'+viewportheight+'</p>');
 
if (viewportwidth >= "1220") {
	document.write('<link rel="stylesheet" type ="text/css" href="/fileadmin/template/on/css/style1200.css" media="screen" />');
}