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;
}