function new_xhr()
{
	var xhrObject = null;
	if(window.XMLHttpRequest) // Firefox et autres
	   xhrObject = new XMLHttpRequest();
	else if(window.ActiveXObject)
	{ // Internet Explorer
	   try  {
				xhrObject = new ActiveXObject("Msxml2.XMLHTTP");
			} 
		catch (e)
			{
				xhrObject = new ActiveXObject("Microsoft.XMLHTTP");
			}
	}
	else
	{ // XMLHttpRequest non supporté par le navigateur
	   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
	   xhrObject = false;
	}
	return xhrObject;
}

function appelContenu(id)
{
	document.getElementById('contenu_products').style.background = '';//url(images/fondTrade.gif);
	document.getElementById('gauche').style.display='none';
	document.getElementById('droite').style.display='none';
	xhrObject=new_xhr();
	
	xhrObject.open('get','includes/contenu.php?id=' + id, true);
	xhrObject.onreadystatechange = traiteReponse;
	xhrObject.send(null);										
}

function traiteReponse()
{
	if(xhrObject.readyState==4)	
		document.getElementById('contenu_products').innerHTML = xhrObject.responseText;	
}