// CSS 振り分け
if(navigator.userAgent.indexOf('Mac') >= 0){
	document.writeln('<link rel="stylesheet" type="text/css" href="css/top_mac.css">');
}else if(navigator.userAgent.indexOf('Win') >= 0){
	document.writeln('<link rel="stylesheet" type="text/css" href="css/top_win.css">');
}