(function(w, d, n) {

  var cl = "bx-core";
  var ht = d.documentElement;
  var htc = ht ? ht.className : undefined;
  if (htc === undefined || htc.indexOf(cl) !== -1)
  {
  return;
  }
  
  var ua = n.userAgent;
  if (/(iPad;)|(iPhone;)/i.test(ua))
  {
  cl += " bx-ios";
  }
  else if (/Android/i.test(ua))
  {
  cl += " bx-android";
  }
  
  cl += (/(ipad|iphone|android|mobile|touch)/i.test(ua) ? " bx-touch" : " bx-no-touch");
  
  cl += w.devicePixelRatio && w.devicePixelRatio >= 2
  ? " bx-retina"
  : " bx-no-retina";
  
  var ieVersion = -1;
  if (/AppleWebKit/.test(ua))
  {
  cl += " bx-chrome";
  }
  else if ((ieVersion = getIeVersion()) > 0)
  {
  cl += " bx-ie bx-ie" + ieVersion;
  if (ieVersion > 7 && ieVersion < 10 && !isDoctype())
  {
  cl += " bx-quirks";
  }
  }
  else if (/Opera/.test(ua))
  {
  cl += " bx-opera";
  }
  else if (/Gecko/.test(ua))
  {
  cl += " bx-firefox";
  }
  
  if (/Macintosh/i.test(ua))
  {
  cl += " bx-mac";
  }
  
  ht.className = htc ? htc + " " + cl : cl;
  
  function isDoctype()
  {
  if (d.compatMode)
  {
  return d.compatMode == "CSS1Compat";
  }
  
  return d.documentElement && d.documentElement.clientHeight;
  }
  
  function getIeVersion()
  {
  if (/Opera/i.test(ua) || /Webkit/i.test(ua) || /Firefox/i.test(ua) || /Chrome/i.test(ua))
  {
  return -1;
  }
  
  var rv = -1;
  if (!!(w.MSStream) && !(w.ActiveXObject) && ("ActiveXObject" in w))
  {
  rv = 11;
  }
  else if (!!d.documentMode && d.documentMode >= 10)
  {
  rv = 10;
  }
  else if (!!d.documentMode && d.documentMode >= 9)
  {
  rv = 9;
  }
  else if (d.attachEvent && !/Opera/.test(ua))
  {
  rv = 8;
  }
  
  if (rv == -1 || rv == 8)
  {
  var re;
  if (n.appName == "Microsoft Internet Explorer")
  {
  re = new RegExp("MSIE ([0-9]+[\.0-9]*)");
  if (re.exec(ua) != null)
  {
  rv = parseFloat(RegExp.$1);
  }
  }
  else if (n.appName == "Netscape")
  {
  rv = 11;
  re = new RegExp("Trident/.*rv:([0-9]+[\.0-9]*)");
  if (re.exec(ua) != null)
  {
  rv = parseFloat(RegExp.$1);
  }
  }
  }
  
  return rv;
  }
  
  })(window, document, navigator);