function makeAjaxRequest(sLink)
{
	var req = newXMLHttpRequest();

	//register the callback handler function
  	var callbackHandler = getReadyStateHandler(req, ajaxCallbackHandler);
  	req.onreadystatechange = callbackHandler;
  	req.open("GET", sLink, true);

  	req.send(null);
	setTimeout("makeAjaxRequest('" + sLink + "')",10000);
}

// This is the callback functions that gets called
// for the response from the server with the XML data

function ajaxCallbackHandler(oResponseXML)
{
  	var sValue;

        sValue = oResponseXML.getElementsByTagName("ny")[0].firstChild.nodeValue;
	document.getElementById("ny").innerHTML = sValue;

        sValue = oResponseXML.getElementsByTagName("ch")[0].firstChild.nodeValue;
	document.getElementById("ch").innerHTML = sValue;

        sValue = oResponseXML.getElementsByTagName("ln")[0].firstChild.nodeValue;
	document.getElementById("ln").innerHTML = sValue;

        sValue = oResponseXML.getElementsByTagName("tk")[0].firstChild.nodeValue;
	document.getElementById("tk").innerHTML = sValue;
}


//the following two functions are helper infrastructure to
//craete a XMLHTTPRequest and register a listner callback function

function newXMLHttpRequest()
{
	var xmlreq = false;
	if (window.XMLHttpRequest) {
		xmlreq = new XMLHttpRequest();

	} else if (window.ActiveXObject) {
    		// Try ActiveX
		try {
			xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) {
			// first method failed
			try {
				xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) {
				 // both methods failed
			}
		}
 	}
   	return xmlreq;
}

function getReadyStateHandler(req, responseXmlHandler)
{
	return function ()
       {
	if (req.readyState == 4) {
		if (req.status == 200)
                {
                	responseXmlHandler(req.responseXML);
//		} else {
//                	alert(req.status);
     		}
    	}
 	}
}