function change_page(sport,competition){
    id_collection = document.getElementById('choix_club').value;
    
    if(id_collection != "0") {
      url_redir = "?sport=" + sport + "&competition="+ competition +"&club=" + id_collection;
    }else {
      url_redir = "?sport=" + sport + "&competition="+ competition;
    }
    
    document.location.href = url_redir;
  }