var strUrl = "ajax.php";
var xmlhttp;

function getXmlRequest() {
  try
    {
    if (window.ActiveXObject) xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
    // Firefox, Opera 8.0+, Safari
    else xmlhttp=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      try
        {
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
      catch (e)
        {
        alert("Your browser does not support AJAX!");
        return false;
        }
      }
    }
    return xmlhttp;
}

function stat_link(from,to)
{
    url = strUrl + "?from=" + from + "&to=" + to;
    //alert(url);
    xmlhttp=getXmlRequest();
    if (xmlhttp)
    {
        xmlhttp.open("GET", url, false);
        xmlhttp.send(null);
        return xmlhttp.responseText; 
    }               
}