setInterval(mark_presence,10000);
function mark_presence()
{

	var ajax_presence = null;
	ajax_presence = new AjaxClassic();					
	

	ajax_presence.setParam({
		url : "http://www.wiziou.com/view/ajaxMarquePresence.php",
		returnFormat : "xml",
		data : "",
		method : "POST",
		asynchronus : true
	});
	
	ajax_presence.execute();

}