(function(){
  var _doc_element = window.document.documentElement;
  var _device = _doc_element.className.toString();
  var classNames = _device.replace( /(?:^[\x09\x0A\x0C\x0D\x20]+)|(?:[\x09\x0A\x0C\x0D\x20]+$)/g, "").split( /[\x09\x0A\x0C\x0D\x20]+/ );
  var mobileyn = classNames.indexOf('mobile');
  var pcyn = classNames.indexOf('desktop');
  var tabletyn = classNames.indexOf('tablet');
  var _doc;
  if (mobileyn >= 0){ _doc ='<link rel="stylesheet" type="text/css" href= "device_mobile.css" media="screen">';
    }else if(pcyn >= 0){ _doc ='<link rel="stylesheet" type="text/css" href= "device_pc.css" media="screen">';
    }else if(tabletyn >= 0){ _doc ='<link rel="stylesheet" type="text/css" href= "device_tablet.css" media="screen">';
  };
  document.write(_doc);
}).call(this);