if ((navigator.userAgent.indexOf('iPhone') > 0 && navigator.userAgent.indexOf('iPad') == -1) || navigator.userAgent.indexOf('iPod') > 0 || navigator.userAgent.indexOf('Android') > 0) {
    document.write('<link type="text/css" rel="stylesheet" href="http://uramayu.typepad.jp/css/ios.css">');
}
<!-- ph=1 -->