var xmlhttp;

function update()
{
	xmlhttp=GetXmlHttpObject();
	if (xmlhttp==null)
  	{
  		alert ("Browser does not support HTTP Request");
  		return;
  	}

  	var url="update.php";
	url=url+"?sid="+Math.random();
	
	xmlhttp.onreadystatechange=stateChanged;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);
}


function stateChanged()
{
	if (xmlhttp.readyState==4)
	{
		document.getElementById("fm").innerHTML=xmlhttp.responseText;
	}
}


function GetXmlHttpObject()
{
	if (window.XMLHttpRequest)
  	{
  		// code for IE7+, Firefox, Chrome, Opera, Safari
  		return new XMLHttpRequest();
  	}
	if (window.ActiveXObject)
  	{
  		// code for IE6, IE5
  		return new ActiveXObject("Microsoft.XMLHTTP");
  	}
	return null;
}

setInterval('update()',5*60000);					// update every 5 minute