computer = ((navigator.platform.indexOf('Win') > -1) ? "pc" : "mac");

if (computer == 'pc')
{
	document.write('<link rel="stylesheet" type="text/css" href="../../../css/' + nummer + '/css-1-pc.css">');
}
else
{
	document.write('<link rel="stylesheet" type="text/css" href="../../../css/' + nummer + '/css-1-mac.css">');
}