function commentaire()
{
	var req = null;
	document.getElementById("avert").innerHTML = "Message en envoyé";
	if(window.XMLHttpRequest)
		req = new XMLHttpRequest();
	else if (window.ActiveXObject)
		req  = new ActiveXObject(Microsoft.XMLHTTP);

	req.onreadystatechange = function()
	{
		if(req.readyState == 4)
		{
			if(req.status == 200)
			{
				document.getElementById("avert").innerHTML = req.responseText;
			}
			else
			{
				document.getElementById("avert").innerHTML = "Erreur: code retourné " + req.status + " " + req.statusText;
			}
		}
	};
	req.open("GET", 'commentaire.pl?nom=' + document.champs.nom.value + '&lecon=' + document.champs.lecon.value + '&commentaire=' + document.champs.contenu.value, true);
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
	req.send(null);
}