// Monitor-Auflösung -> Hintergrundbild-Größe
if (window.innerWidth) w = window.innerWidth; else w = screen.width;
if (w <= 1024) sw = 1024;
else if (w > 1024 && w <= 1280) sw = 1280;
else if (w > 1280 && w <= 1600) sw = 1600;
else sw = 1920;
$bgpath = 'images/bg/'+sw+'/';
document.write('<link rel="stylesheet" href="styles'+sw+'.css" type="text/css" />');