function resort(sortBy, op, country) {
  var docAction = document.SortForm.action;
  var queryString = "";

  if (docAction.indexOf('?') == -1) queryString = "?sort=" + sortBy;
  else queryString = "&sort=" + sortBy;

  if (op != "") queryString += "&op=" + op;
  if (country != "") queryString += "&id=" + country;
  queryString += "#safaris";
  document.SortForm.action += queryString;
  document.SortForm.submit();
}