Script works on one server and not another...

I have the following multipage example script I am practicing with that came from the php cookbook. It works great on my other business's web server, but when I upload it here at this job, it goes to a blank page after clicking "next" on "stage 1". Sounds like a php.ini setting, but I cannot figure out which one. <?php // Turn on sessions session_start(); // Figure out what stage to use if (($_SERVER['REQUEST_METHOD'] == 'GET') || (! isset($_POST['stage']))) { $stage = 1; } else { $stage - (int) $_POST['stage']; } // Save any submitted data if ($stage > 1) { foreach ($_POST as $key => $value) { $_SESSION[$key] = $value; } } if ($stage == 1) { ?> <form action='<?php echo $_SERVER['SCRIPT_NAME'] ?>' method='post'> Name: <input type='text' name='name' /> <br/> Age: <input type='text' name='age' /> <br/> <input type='hidden' name='stage' value='<?php echo $stage + 1 ?>'/> <input type='submit' value='Next' /> </form> <?php } else if ($stage == 2) { ?> <form action='<?php echo $_SERVER['SCRIPT_NAME'] ?>' method='post'> Favorite Color: <input type='text' name='color' /> <br/> Favorite Food: <input type='text' name='food' /> <br/> <input type='hidden' name='stage' value='<?php echo $stage + 1 ?>'/> <input type='submit' value='Done' /> </form> <?php } else if ($stage == 3) { ?> Hello <?php echo $_SESSION['name'] ?>. You are <?php echo $_SESSION['age'] ?> years old. Your favorite color is <?php echo $_SESSION['color'] ?> and your favorite food is <?php echo $_SESSION['food'] ?>. <?php } ?>