function refresh_counter()
{  
    var url = "http://skype.pchome.com.tw/_getcounter.jsp?t=" + new Date().getTime();
    var req = new XMLHttpRequest();
    if (req) 
    {
        window.onerror = function()
        {
            call_counter(600000); 
            return true;   
        }

		req.onreadystatechange = function() 
        {
            if (req.readyState == 4 && req.status == 200) 
            {
                var e = document.getElementById("counter");
                e.innerHTML = req.responseText;
            }
        }
        req.open('GET', url);
        req.send(null);        
    };
    call_counter(600000);    
}

function call_counter(timeout)
{
    window.setTimeout("refresh_counter();", timeout);
}