Changed URL - rewrite to parse portal page?

I just changed domains from ViperAlley to http://forum.viperalley.com; so far, so good, except for one thing.

I've redirected my /forum directory using:

RewriteEngine On
RewriteRule /forum/(.*) http://forum.viperalley.com/$1 [L,R=301]

But, my portal page:

ViperAlley.Com

is no longer processed by vbseo; so it doesn't use the SEO formatted links.

How can I modify the above htaccess rules so that /index.php is processed by the /forum/vbseo.php script? When it tries to execute the /forum/vbseo.php script it's forwarding it over to forum.viperalley.com and showing the vBulletin index.php script and not the index.php in my root directory.

Hello Michael,

as I see, the links are rewritten correctly at your homepage.