// Insert this script at the end of your page

function ab_log_click(){
 if(window.status.indexOf('go to') == 0) {
  adsense_log_url_image = new Image();
  adsense_log_url_image.src = '?cm-adclick=1' + escape(document.location) + '&U=' +  escape(window.status.substring(6));
  // log click goal
  //urchinTracker('/adclicks/adsense');
 }
}

var elements;

if(document.getElementsByTagName) {
 elements = document.body.getElementsByTagName("IFRAME");
} else if (document.body.all) {
 elements = document.body.all.tags("IFRAME");
} else {
 elements = Array();
}

for(var i = 0; i < elements.length; i++) {
 if(elements[i].src.indexOf('googlesyndication.com') > -1) {
  elements[i].onfocus = ab_log_click;
 }
}