function queryString(keyName)
    {
      var keyValue = "";
      keyName = keyName.toUpperCase() + "=";

      if (window.location.href.indexOf("?") != "-1")
      {
        var queryString =
window.location.href.substring(window.location.href.indexOf("?")+1);
        var searchString = queryString.toUpperCase();
        if (searchString.indexOf(keyName) != "-1")
        {
          var keyValueStart =
parseInt(searchString.indexOf(keyName))+keyName.length;
          var keyValueEnd   = searchString.indexOf("&", keyValueStart);
          var keyValueEnd   = (keyValueEnd != "-1") ? keyValueEnd :
searchString.length;
          keyValue          =
queryString.substring(keyValueStart,keyValueEnd);
        }
      }
      return unescape(keyValue.replace(/\+/g," "));
    }