var httpRequest = false;
    function makeRequest() {

        var httpRequest = false;

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            httpRequest = new XMLHttpRequest();
            if (httpRequest.overrideMimeType) {
                httpRequest.overrideMimeType('text/xml');
                // Voir la note ci-dessous à propos de cette ligne
            }
			return httpRequest;
        }
        else if (window.ActiveXObject) { // IE
            try {
                httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
            }
            catch (e) {
                try {
                    httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
                }
                catch (e) {}
            }
			return httpRequest;
        }

        if (!httpRequest) {
            alert('Abandon :( Impossible de créer une instance XMLHTTP');
            return false;
        }
		}
		function jeDerouleGET(purl){
		debugger;
		purl=purl+'?nom='+$('nom').value+'&adresseEmail='+$('adresseEmail').value
		httpRequest=makeRequest();
        httpRequest.onreadystatechange = analyseContenuReponse;
        httpRequest.open('GET', purl, true);
        httpRequest.send(null);

    }
	function jeDeroulePOST(purl,param){
		//debugger;
		httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		httpRequest=makeRequest();
        httpRequest.onreadystatechange = analyseContenuReponse;
        httpRequest.open('POST', purl, true);
        httpRequest.send(param);

    }

    function analyseContenuReponse() {
//debugger;
        if (httpRequest.readyState == 4) {
            if (httpRequest.status == 200) {
				//$('reponse').empty();
				$('reponse').appendText(httpRequest.responseText);
                //alert(httpRequest.responseText);
            } else {
                alert('Un problème est survenu avec la requête.');
            }
        }

    }