Help needed with session/include

[Textahead]

Im wanting to count each page a visitor goes to including if the same page is visited more than once ie; if MR X vivits INDEX.php then CONTACTS.php then back to INDEX.php I need it to count as 3 page visits. I then need a different .php page to display for each page visited. i have the php files loaded as fb00.php, fb01.php , fbo2.php , fb03.php ect ect. heres the code im using

<?php 
if (isset($_SESSION['hit']))
$_SESSION['hit']++; 
else 
$_SESSION['hit']=0; 
$try_file='fb0'.$_SESSION['hit'].'.php'; 
if (file_exists($try_file)) 
include $try_file; 
else 
{ 
$_SESSION['hit']=0; 
} 
?>

It works but only displays fb00.php and I need this to change with each new page
Thanks for any help

P.S. before anyone asks I need this because Im part of a banner exchange that requires a new banner to be displayed on each page. If you have the same banner on each page you get credited with 1 visit even if the visitor goes to 10 pages. If you have different banner on each page you will be credited with 10 visits rather than 1

[JasonDFR]

Are you putting

<?php

session_start();

at the top of each page?

[JasonDFR]

<?php
session_start();

if (isset($_SESSION['hit']))
    $_SESSION['hit']++; 
else 
    $_SESSION['hit']=0; 
    $try_file='fb0'.$_SESSION['hit'].'.php'; 

echo $try_file;


exit;