var urlRedirect = document.URL;
var userAgent = navigator.userAgent
var Expression = new RegExp("iPhone|Android|Palm|webOS|Nokia|Samsung|ZuneWP7|Symbian|BlackBerry", "gi");
var detectMobile = Expression.test(userAgent);
var redirectMobile = getCookie('redirectMobile');
var Expression = new RegExp("skip_mobile_check$");
var result_redirect = Expression.test(urlRedirect);

//Si Mobile
if(detectMobile) {
  //Si Cookie existe 
  if(redirectMobile) {
    //alert('COOKIE existe');
  }
  //Sinon
  else {
    //Vérifie si param  skip_mobile_check
    if(result_redirect) {
      //Création du cookie
      setCookie('redirectMobile', true, null, '/', 'lexpansion.lexpress.fr', null);
      //alert('COOKIE créé');    
    } else {
      //Redirection
      window.location="http://m.lexpansion.com" + document.location.pathname;
    }
  } 
} else {
  //alert('Not MOBILE');
}