Register_Globals directive is set to OFF because of potential security issues. PHP has this directive set to OFF since version 4.2, by default.
You will need to update your script to not require register_global.
For more information, see http://us2.php.net/register_globals
use this instead
$varname = $_POST['varname']; to retrieve a POST variable
and
$varname = $_GET['varname']; to retrieve a GET variable