var agt = navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);
var is_ie = (agt.indexOf("msie")!=-1);
var is_ie3 = (is_ie&&(is_major<4));
var is_ie4 = (is_ie&&(is_major==4)&&(agt.indexOf("msie 5.0")==-1));
var is_ie5up = (is_ie&&!is_ie3&&!is_ie4);

if (navigator.appVersion.indexOf("Mac") !=-1 ) {
	if (is_ie5up) {
		document.write('<link rel=stylesheet type="text/css" href="../css/pc.css">')}
	else {
		document.write('<link rel=stylesheet type="text/css" href="../css/mac.css">')}
}
	else {
		document.write('<link rel=stylesheet type="text/css" href="../css/pc.css">')
}