function startPing () 
{
   	setInterval ("loadXMLDoc('http://lu.lexspider.com/LEXspider/faces/pages/ping.jsp')", 30000);//milliseconds
   	//setInterval ("loadXMLDoc('http://lu-lexspider-testwww.eurospider.com/LEXspider/faces/pages/ping.jsp')", 30000);//milliseconds
   	//setInterval ("loadXMLDoc('http://bs-lexspider-demo.eurospider.com/LEXspider/faces/pages/ping.jsp')", 30000);//milliseconds
   	//setInterval ("loadXMLDoc('http://localhost:8080/LEXspider/faces/pages/ping.jsp')", 30000);//milliseconds
}

function loadXMLDoc(url)
{
	var xmlhttp=null;
 	if (window.XMLHttpRequest)
 	{// code for all new browsers
  		xmlhttp=new XMLHttpRequest();
 	}
 	else if (window.ActiveXObject)
 	{// code for IE5 and IE6
  		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
 	}
 	if (xmlhttp!=null)
 	{
		xmlhttp.onreadystatechange=function() {
						if (xmlhttp.readyState==4) // 4 = "loaded"
					    {
						  	if (xmlhttp.status==200)// 200 = OK
						  	{
						  	}
						  	else
						 	{
								//alert("Problem retrieving XML data");
						  	}
						 }
						 };//end onreadystatechange
	   xmlhttp.open("POST",url,true);
	   xmlhttp.send(null);
	   xmlDoc=xmlhttp.responseXml;
    }
	else
	{
  		//alert("Your browser does not support XMLHTTP.");
 	}
 }