var http_request = false;
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
            }
        } else if (window.ActiveXObject) { // IE
            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;
        }
		//alert(http_request.readyState);
		parameters=get('new'+emplacement);
        http_request.onreadystatechange = function() { modifyContents(http_request, emplacement); };
        http_request.open('POST', url, true);
		http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        http_request.setRequestHeader("Content-length", parameters.length);
        http_request.setRequestHeader("Connection", "close");
		//alert(parameters);
        http_request.send(parameters);
}
function modifyContents(http_request, emplacement) {
//alert(http_request.readyState);
			//alert(http_request.status);
			if (http_request.readyState == 4) {
			//alert(http_request.status);
            if (http_request.status == 200) {
                var XMLDoc = http_request.responseXML ;
				alert(http_request.responseText);
				alert(XMLDoc);
				var tabresultat= XMLDoc.getElementsByTagName('resultat').item(0);
				var resultat=tabresultat.firstChild.nodeValue;
				alert(resultat);
				
				var option = XMLDoc.getElementsByTagName("opt");
				for (var i = 0; i < option.length; i++) {
					var tabvaleur = option[i].getElementsByTagName("valeur");
					var valeur=tabvaleur[0].firstChild.nodeValue;
					var tabid = option[i].getElementsByTagName("id");
					var id=tabid[0].firstChild.nodeValue;
					alert(valeur+", "+id);
				}
				
				
				
				//ajouter_choix(emplacement,
            } else {
                alert('Un problème est survenu avec la requête.');
            }
        }
    }
			
		
 
	
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