var _Constants = 
{
  ReadyState: 
  {
    Uninitialized: 0, Loading: 1, Loaded: 2, Interactive: 3, Complete: 4
  }
  , 
  Status: 
  {
    OK: 200, 
    Created: 201, Accepted: 202, NoContent: 204, 
    BadRequest: 400, Forbidden: 403, NotFound: 404, Gone: 410, 
    ServerError: 500
  }
  , 
  Method: 
  {
    Get: "GET", Post: "POST"
  }
  , 
  IEHttpObject: "Microsoft.XMLHTTP"
}
var _isIE = window.ActiveXObject ? true : false;
function CallBack()
{
  if (_ServerRequest.readyState == _Constants.ReadyState.Complete)
  {
    if (_ServerRequest.status == _Constants.Status.OK)
    {
      eval(_ServerRequest.responseText);
    }
    else
    {
      alert("There was a problem retrieving the Server data:\n" + _ServerRequest.statusText);
    }
  }
}
var ServerRequest = 
{
  PrepareRequest: function(data, mthd)
  {
    var queryString = "";
    for (i = 0; i < data.length; i += 2)
    {
      queryString += data[i] + "=" + data[i + 1] + "&";
    }
    return queryString;
  }
  , 
  Execute: function(url, mthd, data)
  {
    if (!_isIE)
      _ServerRequest = new XMLHttpRequest();
    else
      _ServerRequest = new ActiveXObject(_Constants.IEHttpObject);
    if (_ServerRequest)
    {
      _ServerRequest.onreadystatechange = CallBack;
      url += "?rnd=" + Math.random() + "&";
      if (mthd == _Constants.Method.Get)
        if (data)
      if (data.length > 0)
      {
        url += ServerRequest.PrepareRequest(data, mthd);
      }
      var useAsync = arguments[3] != null ? arguments[3]: true;
      _ServerRequest.open(mthd, url, useAsync);
      if (mthd == _Constants.Method.Post)
      {
        _ServerRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        _ServerRequest.send(ServerRequest.PrepareRequest(data));
      }
      else
      {
        _ServerRequest.send(null);
      }
      if (!_isIE && !useAsync)
      {
        CallBack();
      }
    }
  }
}