var Win = (navigator.appVersion.indexOf("Windows") != -1);
var Mac = (navigator.appVersion.indexOf("Mac") != -1);

if(Mac) {
document.write('<link href="http://matsui-mfg.net/css/macstyles.css" rel="stylesheet" type="text/css" />');
} else {
document.write('<link href="http://matsui-mfg.net/css/styles.css" rel="stylesheet" type="text/css" />');
}