function trackClick (ad) { 
       
      if (window.XMLHttpRequest) { 
         var ajax = new XMLHttpRequest; 
      } else { 
         var ajax = new ActiveXObject('Microsoft.XMLHTTP'); 
      } 
       
      ajax.open('get', 'track.send.php?ad=' + ad + '&ip=38.107.191.119', false); 
       
      ajax.send(null); 

   }