Shared SSL Shared Host - Can't view any page but my homepage using my SSL

Hello all , I am having some issues regarding my shared ssl and how to set it up on drupal.

I have read numerous posts about issues with setting it up. I am able to view my home page using my shared ssl but cannot view any other page on my drupal site using my shared ssl. The main post I followed was http://drupal.org/node/339552 which gave a script to put in the settings.php file.

01:  $request_type = ($_SERVER['HTTP_X_FORWARDED_HOST'] == 'ssl.proxy.org') ? 'SSL' : 'NONSSL';
02:  if($request_type!="SSL"){
03:    //header("Location:https://ssl.proxy.org/www.example.com");
04:    $base_url = 'http://www.example.com';  // NO trailing slash!
04a:   $base_url = 'http://www.example.com/some/dir';  // NO trailing slash!
05:    $cookie_domain = 'www.example.com';
06:  } else {
07:    $base_url = 'https://ssl.proxy.org/www.example.com';  // NO trailing slash!
07a:   $base_url = 'https://ssl.proxy.org/www.example.com/some/dir';  // NO trailing slash!
08:    $cookie_domain = 'ssl.proxy.org';
09:    $_SERVER['HTTPS']='on';
10:    $_SERVER['REQUEST_URI']='/www.example.com'. $_SERVER['REQUEST_URI'];
10a:   $_SERVER['REQUEST_URI']='/www.example.com'. $_SERVER['REQUEST_URI']; // Only the DNS name of the site needed here!
11:    $conf = array(
12:            'reverse_proxy' => TRUE,
13:            'reverse_proxy_addresses' => array($_SERVER['REMOTE_ADDR']),
14:    );
15:  }

I followed this to the letter but am still having problems. Once this has been put in my settings.php and all my site info added in the relevant places I am no longer able to go to my home page using my secure address, I get a 404 error saying "URL /home/sites/example.com/public_html/index.php was not found on this server." When accessing my homepage through normal http:// I just get a blank white screen.

If anyone could guide me in how to sort this out as I have contacted my web server and their response is they can't really support scripting questions but thought that this script should work.