// coretime
client_id = 7;

function base64_encode(decStr) {
 var base64s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
 var bits;
 var dual;
 var i = 0;
 var encOut = '';

 while(decStr.length >= i + 3) {
  bits = (decStr.charCodeAt(i++) & 0xff) <<16 |
         (decStr.charCodeAt(i++) & 0xff) <<8 |
          decStr.charCodeAt(i++) & 0xff;
  encOut += base64s.charAt((bits & 0x00fc0000) >>18) +
            base64s.charAt((bits & 0x0003f000) >>12) +
            base64s.charAt((bits & 0x00000fc0) >> 6) +
            base64s.charAt((bits & 0x0000003f));
 }

 if(decStr.length -i > 0 && decStr.length -i < 3) {
  dual = Boolean(decStr.length -i -1);
  bits = ((decStr.charCodeAt(i++) & 0xff) <<16) |
         (dual ? (decStr.charCodeAt(i) & 0xff) <<8 : 0);
  encOut += base64s.charAt((bits & 0x00fc0000) >>18) +
            base64s.charAt((bits & 0x0003f000) >>12) +
            (dual ? base64s.charAt((bits & 0x00000fc0) >>6) : '=') +
            '=';
  }

  return(encOut);
}

resolution = window.screen.width      + 'x' +
             window.screen.height     + 'x' +
             window.screen.colorDepth + 'bit';

document.write('<img src="http://sourcetracker.netaffinity.co.uk/logging/image.php?' +
               'client_id='              + client_id    + '&' +
               'document='               + document.URL + '&' +
               'referer='                + base64_encode(document.referrer) + '&' +
               'add_data[]=resolution::' + resolution   +
               '" alt="" width="1" height="1" />'
              );