function test(){alert ("ok")}

function log(){
 bug = new Image();
 bug.src = 'http://www.facile.be/cgi-bin/cgi-divers/adsense4.cgi?&ref=' + document.location + '&url=' + window.status + '&i=' + i + '&t=' + t;
}
var elements;
elements = document.getElementsByTagName("iframe");
for (var y = 0; y < elements.length; y++)
{
  if (
  (elements[y].src.indexOf('googlesyndication.com') > -1) ||
  (elements[y].src.indexOf('googleadservices.com') > -1) )
  { 
    elements[y].onfocus = log;
  }
}