function getURLParam(sParamName)
{
  var sParamValue = "";
  var sHref = window.location.href;
  if (sHref.indexOf("?") > -1)
  {
    var sQueryString = sHref.substr(sHref.indexOf("?"));
    var arrParams = sQueryString.split("&");
    for (var j=0; j<arrParams.length; j++)
    {
      if (arrParams[j].indexOf(sParamName + "=") > -1 )
      {
        var arrNameAndValue = arrParams[j].split("=");
        sParamValue = arrNameAndValue[1];
        break;
      }
    }
  }
  return sParamValue;
}