Autoloading

I am using __autoload for my site which is conflicting with the autoloading of PHPExcel. I tried using spl_autoload_register thinking that might be the way to go but when I tried I got a "cannot be redeclared" error. I include my autoload script (include_once "../../lib/autoload.php";) and my autoload.php script looks like this: <? function __autoload($class_name) { $path="../../lib/class.$class_name.php"; if(file_exists($path)) { require_once $path; } } ?> As stated, when I change __autoload to spl_autoload_register I get the can't be redeclared error. Any ideas? Thanks! Floyd