function storeAddress(el) {
        var message = document.getElementById("response");
        var email = escape(el.email.value);
        processEmail(message, email);
    }
    function createRequestObject(){
        var request;
        var browser = navigator.appName;
        if(browser == "Microsoft Internet Explorer"){
            request = new ActiveXObject("Microsoft.XMLHTTP");
        }else{
            request = new XMLHttpRequest();
        }
        return request;
    }

    function processEmail(el, email){
        el.innerHTML = "Adresse email ajoutée...";
        var http = createRequestObject();
        http.open("get", "http://www.ecologie-pratique.org/newsletter/index.php?view=add&email="+email, true);
        http.onreadystatechange = function() { handleResponse(el, http) };
        http.send(null);
    }

    function handleResponse(el,http){
        if(http.readyState == 4){ //Finished loading the response
            if(http.status ==200){
                el.innerHTML = http.responseText;
                document.getElementById("NL_form").innerHTML = "";
            }else{
                el.innerHTML =  http.statusText;
            }
        }
    }