var stylesheet, hoehe;
	
	if (window.innerHeight) {
		hoehe = window.innerHeight;
	} else {
		hoehe = document.body.clientHeight;
		if (hoehe == 0) {
		    hoehe = document.documentElement.clientHeight;
		}
	}

    if (hoehe >= 800) {
	   stylesheet = rootFolder + '/css/ttc_800.css';
    }
    else if (hoehe >= 571) {
	   stylesheet = rootFolder + '/css/ttc_571.css';
    }
    else {
	   stylesheet = rootFolder + '/css/ttc_570.css';
    }

    document.writeln('<style type="text/css"> @import url(', stylesheet, '); <\/style>');