// construction objet XmlHttpRequest
function getXmlHttpRequest(){

if (window.XMLHttpRequest){
	xhr = new XMLHttpRequest();
	if (xhr.overrideMimeType)
		xhr.overrideMimeType('text/xml');
}
else if (window.ActiveXObject){
	try{
		xhr = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e){
		xhr = new ActiveXObject("Microsoft.XMLHTTP");
	}
}
else {
	alert("Votre navigateur ne supporte pas l'objet XMLHttpRequest");
	xhr = false;
	}
}

function afficher_jsAgenda(id){
	getXmlHttpRequest();
	xhr.onreadystatechange = function(){
		if (xhr.readyState == 4 && xhr.status == 200){
			var reponse = xhr.responseText;
			document.getElementById("jagenda").innerHTML = reponse;
		}
	}
	xhr.open("POST","xagenda.php",true);
	xhr.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	var selection_mois = document.getElementById("mois");
	var mois = selection_mois.options[selection_mois.selectedIndex].value;
	xhr.send("mois="+mois+"&id="+id);
}