function exitpop()
{
  url = "http://imagesrv.adition.com/bu/exit.php?title=" + adition_title + "&id=" + adition_wp_id;
  prop = 'width='+adition_width+',height='+adition_height+',left=10,top=10';
  win = window.open(url,'_blank',prop);
}

window.onunload = exitpop;