//sniffer for stylesheet link
var cssLink;

if (document.layers && (navigator.userAgent.indexOf("Win")!=-1))    {
    cssLink = '<link href="css/winNS.css" rel="styleSheet" type="text/css">';
    }
else if (document.layers) {
    cssLink = '<link href="css/macNS.css" rel="styleSheet" type="text/css">';
    }
else {
    cssLink = '<link href="css/gen.css" rel="styleSheet" type="text/css">';
    }
    
document.write(cssLink);