function updateUseronline(){
	// Mozilla
	if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest(); }
	// IE
	else if (window.ActiveXObject) { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }
   
	var params="";
	xmlhttp.open("POST", 'ajax/-uo.php', true);
	xmlhttp.setRequestHeader("Pragma", "no-cache");
	xmlhttp.setRequestHeader("Cache-Control", "must-revalidate");
	xmlhttp.setRequestHeader("If-Modified-Since", new Date());

	xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=UTF-8");
	xmlhttp.setRequestHeader("Content-length", params.length);
	xmlhttp.setRequestHeader("Connection", "close");
	//document.getElementById("uoindicator").style.visibility='visible';

	xmlhttp.onreadystatechange = function() {
	        if(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
			document.getElementById("useronline").innerHTML=xmlhttp.responseText;
			//document.getElementById("uoindicator").style.visibility='hidden';
			setTimeout("updateUseronline()",30000);
		}
	}
    	xmlhttp.send(params);
}