function AppendQuerystringToForm(widgetDivId, sQuerystring, sFieldName)
{
     var qs  = document.location.search.substring(1)
     var qsArray = qs.split("&")
     var qsMap = {};     
     for (i= 0 ; i < qsArray.length; i++)
     {
          var param = qsArray[i];
          var qsParts = param.split("=")
          qsMap[qsParts[0]] = qsParts[1];
     }

     if (typeof(qsMap[sQuerystring]) != "undefined")
     {
          var div = document.getElementById(widgetDivId);
          var frame = div.childNodes[0];
          frame.src += "&"+sFieldName+"="+qsMap[sQuerystring];
     }
}