function makeRequest(url,data) {
        var http_request = false;
        if (window.XMLHttpRequest) {
                http_request = new XMLHttpRequest();
                if (http_request.overrideMimeType) {
                        http_request.overrideMimeType('text/xml');
                }
        } else if (window.ActiveXObject) {
                try {
                        http_request = new ActiveXObject("Msxml2.XMLHTTP");
                } catch (e) {
                        try {
                                http_request = new ActiveXObject("Microsoft.XMLHTTP");
                        } catch (e) {}
                }
        }

        if (!http_request) {
                alert('Abandon :( Impossible de créer une instance XMLHTTP');
                return false;
        }

        http_request.onreadystatechange = function() { alertContents(http_request); };
        http_request.open('GET', url, true);
        http_request.send(data);
}

function alertContents(http_request) {
        if (http_request.readyState == 4) {
                if (http_request.status == 200) {
                        document.getElementById( 'contenu' ).innerHTML = http_request.responseText;
                } else {
                        alert('Un problème est survenu avec la requête.');
                }
        }
}