function makeRequest(url) {

        var httpRequest = false;
	    	document.getElementById('bloc-ajax').innerHTML = '<div style="background-image:url(loading.gif);width:183px; height:72px;background-repeat:no-repeat;background-position:center;margin:auto"><\/div>';

		  
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            httpRequest = new XMLHttpRequest();
            if (httpRequest.overrideMimeType) {
                httpRequest.overrideMimeType('text/xml');
            }
        }
        else if (window.ActiveXObject) { // IE
            try {
                httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
            }
            catch (e) {
                try {
                    httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
                }
                catch (e) {}
            }
        }

        if (!httpRequest) {
            alert('Abandon :( Impossible de créer une instance XMLHTTP');
            return false;
        }
        httpRequest.onreadystatechange = function() { alertContents(httpRequest); };
        httpRequest.open('GET', url, true);
        httpRequest.send(null);
    }

    function alertContents(httpRequest) {

        if (httpRequest.readyState == 4) {
            if (httpRequest.status == 200) {
                document.getElementById('bloc-ajax').innerHTML = httpRequest.responseText;
            } else {
                document.getElementById('bloc-ajax').innerHTML = "Dommage";
            }
        }

    }