function email_add(){
    var url = "/newsletter.php?action=email_add";
    var data = new Object();
    
    /**
     * Wykrywanie języka strony na podstwie url w pasku adresu
     */
    if(location.href.search("/en/") != -1) data["language"] = 2;
    else if(location.href.search("/de/") != -1) data["language"] = 3;
    else  data["language"] = 1;
   
    data["email"] = $("input#email").val();
    $.post(url, data, function(data){$("#message").html(data)});
}