var axel = Math.random();
var randomNumber = axel * 100000000000000000;
function writeTrackerImage(id) {
   var imageTag = '<IMG SRC="/images/1pxtrans.gif?Id=';
   imageTag += id;
   imageTag += '&num=';
   imageTag += randomNumber;
   imageTag += '" border="0" width="1" height="1">';
   document.write(imageTag);
}