gistfile1.js

function sendLog (urlWithLog) {
  var img = new Image(), no, caches;
  
  if (sendLog.count >= Number.MAX_VALUE) sendLog.count = 0;
  no = 'no' + sendLog.count++;
  caches = sendLog.caches;
  // hold on reference, otherwise image object may be GCed and abort request that has not been send
  caches[no] = img;
  // delete reference
  img.onload = img.onerror = img.onabort = function () {
    delete caches[no];
  };
  img.src = urlWithLog;
}
sendLog.caches = {};
sendLog.count = 0;