//ユーザーエージェント
var agent = navigator.userAgent;

//ブラウザ判別
if (agent.indexOf("Safari") != -1){
	//Safari
	document.write('<link rel="stylesheet" type="text/css" href="common/style_mac.css">');
}else if (agent.indexOf("Mac") != -1 && agent.indexOf("Firefox") != -1){
	//Mac Firefox
	document.write('<link rel="stylesheet" type="text/css" href="common/style_mac.css">');
}else{
	document.write('<link rel="stylesheet" type="text/css" href="common/style.css">');
}