var rtXMLObj = false; // XMLHttpRequest Object
var rtXMLBackend = 'rtXML.php'; // Backend url
window.setInterval("Update_RT_XML()", 300000);// update the data every 5 mins

if (window.XMLHttpRequest) // try to create XMLHttpRequest
	rtXMLObj = new XMLHttpRequest();

if (window.ActiveXObject)	// if ActiveXObject use the Microsoft.XMLHTTP
	rtXMLObj = new ActiveXObject("Microsoft.XMLHTTP");

Update_RT_XML();

/*
* onreadystatechange function
*/
function WhenRequestIsReady() 
{
	// If data received correctly
	var dummy ="";
}

function Update_RT_XML() 
{
	// Prepare the request
	rtXMLObj.open("GET", rtXMLBackend , true);
	// Set the onreadystatechange function
	rtXMLObj.onreadystatechange = WhenRequestIsReady;
	// Send
	rtXMLObj.send(null); 
}

function update_timer() 
{
	Update_RT_XML();
}