var oldOnload = typeof(window.onload) != "undefined" ? window.onload : null;
window.onload = function () {
  var matches;
  var target = 'visit';
  var url = window.location;
  if (matches = new String(url).match(/mid=([0-9]+)/)) { target += "/id/"+ matches[1]; }
  (new Image()).src = new String(document.getElementById('ctrack').src).replace(/js/,target);
  if (oldOnload) { oldOnload(); }
}