function getXMLHttpRequest() {
	var xhr = null;
	
	if (window.XMLHttpRequest || window.ActiveXObject) {
		if (window.ActiveXObject) {
			try {
				xhr = new ActiveXObject("Msxml2.XMLHTTP");
			} catch(e) {
				xhr = new ActiveXObject("Microsoft.XMLHTTP");
			}
		} else {
			xhr = new XMLHttpRequest(); 
		}
	} else {
		alert("Votre navigateur ne supporte pas l'objet XMLHTTPRequest...");
		return null;
	}
	
	return xhr;
}

function request(oSelect) {
	var value = oSelect.options[oSelect.selectedIndex].value;
	var xhr   = getXMLHttpRequest();
	
	xhr.onreadystatechange = function() {
		if (xhr.readyState == 4 && (xhr.status == 200 || xhr.status == 0)) {
			readData(xhr.responseXML);
			//document.getElementById("loader").style.display = "none";
		} else if (xhr.readyState < 4) {
			//document.getElementById("loader").style.display = "inline";
		}
	};
	
	xhr.open("POST", "./Ajax/listeActivite.php", true);
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xhr.send("IdThes=" + value);
}

function readData(oData) {
	var nodes   = oData.getElementsByTagName("item");
	var oSelect = document.getElementById("listeActivite");
	var oOption, oInner;
	
	oSelect.innerHTML = "";
	for (var i=0, c=nodes.length; i<c; i++) {
		oOption = document.createElement("option");
		oInner  = document.createTextNode(nodes[i].getAttribute("name"));
		oOption.value = nodes[i].getAttribute("id");
		
		oOption.appendChild(oInner);
		oSelect.appendChild(oOption);
	}
}