link media を使ったcssの読み込み分岐

<!--以下、スタイルシートの部-->
<link rel="stylesheet" type="text/css" href="css/base_css/reset_a.css" />
<link rel="stylesheet" type="text/css" href="css/base_css/font_reg_a.css" />
<link rel="stylesheet" type="text/css" href="css/kamogashira.info_css/font_a.css" />
<link rel="stylesheet" type="text/css" href="css/kamogashira.info_css/2_right_a.css" media="screen and (min-width:481px)" />
<link rel="stylesheet" type="text/css" href="css/kamogashira.info_css/1_a.css" media="only screen and (max-width:480px)" />