function changeLang() {
  var url = window.location.href;
  var reEn = new RegExp("/en/");
  var reFr = new RegExp("/fr/");
  var m = reEn.exec(url);
  if (m == "/en/") 
  {
    link = url.replace(reEn, "/fr/");
    //link = link.replace(url.substring(url.indexOf("?")), '');
  } else 
  {
    link = url.replace(reFr, "/en/");
    //link = link.replace(url.substring(url.indexOf("?")), '');
  }
  window.navigate(link);
}