function track () {
  var rnd = Math.round(Math.random() * 1000000);
  var url = '/pcgi/track.pl?d=' + escape(window.location.href) + '&r=' + escape(document.referrer) + '&rnd=' + rnd;
  document.write("<img width=1 height=1 src='" + url + "'>");
}

function monthsel (mid) {
  var ndx = mid.selectedIndex;
  window.location.href = mid.options[ndx].value + ".html";
}

function rangesel (rid) {
  var ndx = rid.selectedIndex;
  window.location.href = "vvg_6-" + rid.options[ndx].value + ".html";
}