Ajax Code :

// Run when the page is loaded
function init(evt)
{
    svgdoc=evt.target.ownerDocument;
    try
    {
        req = new ActiveXObject("Microsoft.XMLHTTP");    // try Internet Explorer
    }
    catch(e)  
    {
        req = new XMLHttpRequest() // firefox
    }
    req.open("POST", "init", true); // ASYNC Request);   
   
  // Query the server and update the SVG with any changes using setAttribute
    req.onreadystatechange = function()
    {
        if (req.readyState == 4 && req.responseText)
        {
            eval(req.responseText);
        }
    }
    req.send(null);
    queryServerPooling(evt);
}

// Send every 100 ms a message to the server
function queryServerPooling(evt)
{
    try
    {
        req = new ActiveXObject("Microsoft.XMLHTTP");    // try Internet Explorer
    }
    catch(e)
    {
        req = new XMLHttpRequest() // firefox
    }
    req.open("POST", "init", true); // ASYNC Request);   
   
  // Query the server and update the SVG with any changes using setAttribute
    req.onreadystatechange = function()
    {
        if (req.readyState == 4 && req.responseText)
        {
            eval(req.responseText);
        }
    }
    req.send(null);
    setTimeout(queryServerPooling, 100)
}