<link rel="stylesheet" href="<?php bloginfo( 'template_url' ); ?>/style/mobile.css" media="screen and (max-width: 480px)" />

<link rel="stylesheet" href="<?php bloginfo( 'template_url' ); ?>/style/style.css" media="screen and (min-width: 481px)" />

<script type="text/javascript" src="<?php bloginfo( 'template_url' ); ?>/js/custom.js"></script>

<!--[if IE 9]>
<script type="text/javascript" src="<?php bloginfo( 'template_url' ); ?>/js/html5.js"></script>
<link rel="stylesheet" href="<?php bloginfo( 'template_url' ); ?>/style/style.css" />
<link rel="stylesheet" href="<?php bloginfo( 'template_url' ); ?>/style/ie.css" />
<![endif]-->