function makeRequest(url, parameters) 
{
  http_request = false;
  if (window.XMLHttpRequest) 
  { 
    // Mozilla, Safari,...
    http_request = new XMLHttpRequest();

    if (http_request.overrideMimeType) 
    {
      // set type accordingly to anticipated content type
      //http_request.overrideMimeType('text/xml');
      http_request.overrideMimeType('text/html');
    }
  } 
  else if (window.ActiveXObject) 
  { 
    // IE
    try 
    {
      http_request = new ActiveXObject("Msxml2.XMLHTTP");
    } 
    catch (e) 
    {
      try 
      {
        http_request = new ActiveXObject("Microsoft.XMLHTTP");
      } 
      catch (e) {}
    }
  }
  if (!http_request) 
  {
    //alert('Cannot create XMLHTTP instance');
    return false;
  }
  
  //http_request.onreadystatechange = alertContents;
  http_request.open('GET', url + parameters, true);
  http_request.send(null);
}

function alertContents() 
{
  if (http_request.readyState == 4) 
  {
    if (http_request.status == 200) 
    {
      //alert(http_request.responseText);
      //result = http_request.responseText;
    } 
    else 
    {
      alert('There was a problem with the request.');
    }
  }
}

var querystring = '';

function addParameter(field, value) 
{
    if(querystring == '')
    {
    querystring+=('?'+field+'='+value);
    }
    else
    {
      querystring+=('&'+field+'='+value);
    }
}


addParameter("screen.colorDepth",window.screen.colorDepth);
addParameter("screen.width",window.window.screen.width);
addParameter("screen.height",window.window.screen.height);
addParameter("navigator.AppName",navigator.appName);
addParameter("navigator.appVersion",navigator.appVersion);
addParameter("window.screen.availWidth",window.screen.availWidth);
addParameter("window.screen.availHeight",window.screen.availHeight);
addParameter("navigator.appCodeName",navigator.appCodeName);
addParameter("navigator.platform",navigator.platform);
addParameter("document.location",document.location);
addParameter("top.document.referrer",top.document.referrer);

makeRequest('tracker.sb',querystring);