[users@httpd] Extra garbage in URL when using mod_rewrite with redirects

[Philip Pemberton <usenet06@xxxxxxxxxxxxx>]

Hi,
  I have the following rewrite rules in my site's .htaccess:

--- begin cut

RewriteEngine On

# Only rewrite URLs on the primary domain, not subdomains
RewriteCond %{HTTP_HOST} ^www\.philpem\.me\.uk$  [OR]
RewriteCond %{HTTP_HOST} ^philpem\.me\.uk$

# This makes sure AWStats can get through
RewriteCond %{REQUEST_URI} !^/awstats.* [NC]

# page manager
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
RewriteRule ^(.*)$ index.php?$1 [L]

-- end cut

  The problem is, a few other sites are linking to my site using old URLs 
(www.philpem.me.uk/forum, for example is now forum.philpem.me.uk). To get 
around this, I've added this rule to my htaccess:

RedirectPermanent /forum http://forum.philpem.me.uk
RedirectPermanent /blog http://blog.philpem.me.uk

My problem is that when the redirect is triggered by someone going to 
http://www.philpem.me.uk/forum/, instead of being redirected to 
http://forum.philpem.me.uk/, they're redirected to 
http://forum.philpem.me.uk//?forum/. Similarly, /blog redirects to 
http://blog.philpem.me.uk/?blog/.

Although the stuff after the ? is pretty benign (the scripts in those 
directories just ignore it), for the sake of URL tidiness I'd like to get rid 
of it. Can anyone tell me what I need to add to my htaccess to do that?

Thanks.
--
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