<script>
    $(document).ready(function() {
         $.ajax({

                type: "GET",
                url: "getip.php",

            }); // Ajax Call
        }); //event handler
   </script>

<?php
// location of the text file that will log all the ip adresses
$file = 'logfile.txt';

// ip address of the visitor
$ipadress = $_SERVER['REMOTE_ADDR'];

// date of the visit that will be formated this way: 29/May/2011 12:20:03
$date = date('d/F/Y h:i:s');

// name of the page that was visited
$webpage = $_SERVER['SCRIPT_NAME'];

// visitor's browser information
$browser = $_SERVER['HTTP_USER_AGENT'];

// Opening the text file and writing the visitor's data
$fp = fopen($file, 'a');

fwrite($fp, $ipadress.' - ['.$date.'] '.$webpage.' '.$browser."rn");

fclose($fp);
?>

<script>
    $(document).ready(function() {
         $.post('getip.php'); // Ajax Call
        }); //event handler
</script>

.done(function( data ) {
  alert(data);
});