function getPiece(vid_num)
{
        var req = null;
        document.getElementById("vid").innerHTML = "Started...";
 
        if (window.XMLHttpRequest)
        {
                req = new XMLHttpRequest();
                if (req.overrideMimeType)
                        {
                          req.overrideMimeType('text/xml');
                        }
        }
        else if (window.ActiveXObject)
        {
                try {
                        req = new ActiveXObject("Msxml2.XMLHTTP");
                } catch (e)
                {
                        try {
                                req = new ActiveXObject("Microsoft.XMLHTTP");
                        } catch (e) {}
                }
                }

        req.onreadystatechange = function()
        {
                document.getElementById("vid").innerHTML = "Wait server...";
          if(req.readyState == 4)
          { 
                if(req.status == 200)
                {
                  document.getElementById("vid").innerHTML  =  req.responseText;
                }
                else
                {
                  document.getElementById("vid").innerHTML="Error: returned status code " + req.status + " " + req.statusText;
                }
          }
        };
                req.open("GET", vid_num + ".php", true);
                req.send(null);
} // end getPiece function.