function wichLanguage()
{
  var url, lang;

  lang = ( navigator.appName == "Microsoft Internet Explorer" ) ? navigator.userLanguage : navigator.language;
  lang = lang ? lang.substring(0, 2).toLowerCase() : "";

  if( lang  == "en" )
      url="./en/index.html";
  else if( lang  == "fr" )
      url="./fr/index.html";
  else
      url="./es/index.html";

  window.location.href=url;
}