language-detect.js

/*
 Detects the browser language
 */
var userLang = navigator.language || navigator.userLanguage;

/*
 test if ou cookie is set
 */
if(getCookie("lang")){
  //   it is set, so no redirect
}
else{
  // The cookie is not set, so set it, and redirect
  langstring=userLang.split('-')[0];
  lang = "lang="+langstring;
  document.cookie=lang;
  redirect(langstring);
}

/*
 Returns the given cookie or false if not existing
 */
function getCookie(name){
  var re = new RegExp(name + "=([^;]+)");
  var value = re.exec(document.cookie);
  return (value != null) ? unescape(value[1]) : null;
}

/*
 Function used to clean our language cookie
 */
function clearCookie(){
  var mydate = new Date();
  mydate.setTime(mydate.getTime() - 1);
  document.cookie = "lang=; expires=" + mydate.toGMTString();
}

/*
 redirects to the desired URLs
 Only the first two letters of the ISO country code are used
 */
function redirect(actuallang){
  var url ='/';
  switch(actuallang){
    case 'en':
      url ='http://link-en';
      break;
    case 'fr':
      url ='http://link-fr';
      break;
    case 'ru':
      url ='http://link-ru';
      break;
    case 'es':
      url ='http://link-es';
      break;
    case 'de':
      url ='http://link-de';
      break;
    default:
      url='http://link-default';
      break;
  }
  window.location.replace(url);
}