var doNotDelete;

/* 
	* Role : Instanciate the XmlHttpRequest object
	* Input : no input
	* Output : no output
	* Date : 24/12/2007
*/
function getXmlHttp()
{
	if(window.XMLHttpRequest) var xhr = new XMLHttpRequest();
	else if(window.ActiveXObject)
	{
		try 
		{ 
			var xhr = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e)
		{
			try 
			{
				var xhr = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e1) 
			{
				xhr = null;
			}
		}
	}
	else alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
	return xhr;
}

/* 
	* Role : Call the specified page by AJAX
	* Input : pageURL (string) -> the url of the script to call
	* Output : no output
	* Date : 24/12/2007
*/
function deleteOnUnload(pageURL)
{
	if (doNotDelete) return;
	xmlhttp.open("GET", pageURL, true);
	xmlhttp.send(null);
}