Rewrite rules & Subdomains

Hi,

We are looking to use rewrites rules for subdomains.

Ex: http://sub.domain.com -> http://www.domain.com/sub

We use this rule:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^[^.]+\.DOMAIN\.TLD$
RewriteRule ^(.+) %{HTTP_HOST}$1 [C]
RewriteRule ^([^.]+)\.DOMAIN\.TLD(.*) /HOME/USER/$1$2

But it only works whith Netscape/Mozilla, with MS IE pics are not shown.

Does S/O have an idea of our mistake ?

Thanks

Julien