Please create a php.ini file with content

register_globals = ON

then ftp upload php.ini file to your root / just above www/public_html.

That will turn on register_globals for your website.

You can create a php info page (info.php) to check php settings

// Show all information, defaults to INFO_ALL
phpinfo();
?>

This method works on Windows 2003 as well (upload php.ini file to wwwroot folder)