mod_rewrite problem

I am trying to make all request to halo.example.net refer to www.example.net/apps/halo.

Here is my .htaccess
ErrorDocument 403 /403.jsp
ErrorDocument 404 /404.jsp
ErrorDocument 500 /500.jsp

RewriteEngine on

RewriteCond %{HTTP_HOST} ^halo$
RewriteRule ^(.*)$ http://www.example.net/apps/halo/$1 [R=301,L]

RewriteBase /
RewriteRule ^([a-z_A-Z0-9]+)$ index.jsp?title=$1
RewriteRule ^photos/([a-z_A-Z0-9]+)$ /photos/index.jsp?title=$1

AddType application/x-java-jnlp-file jnlp

The lines that concern me are:
RewriteCond %{HTTP_HOST} ^halo$
RewriteRule ^(.*)$ http://www.example.net/apps/halo/$1 [R=301,L]

Everything else works properly.

With this .htaccess file when I type in http://halo.example.net in address bar I get this error:

Forbidden
You don't have permission to access / on this server.

If I change the rewrite rule and condition to look like this:

RewriteCond %{HTTP_HOST} ^halo$
RewriteRule ^(.*) http://www.example.net/apps/halo/$1

I get this error:

404 Not Found
/403.jsp was not found on this server.

Can someone tell me what I am doing wrong.

Thank you,
Michael

[edited by: jdMorgan at 2:42 am (utc) on Jan. 17, 2004]
[edit reason] No specific URLs, please. See TOS. [/edit]