HELP: Add header in pages server by Proxy

Hi everyone!

To my course final course i need to add a header (a file 
with some html) in all pages served by the Apache proxy.

I'm using the mod_layout installation from Mandrake 9.1, 
and only the LayoutHeader directive is working, with any 
other directive apache doesn't start saying that the 
directive isn't defined.

The configuration I have currently tested is:

<IfModule mod_proxy.c>
   Listen 8080
   <VirtualHost 192.168.8.2:8080>
     <Proxy *>
       Order deny,allow
       Deny from all
       Allow from 192.168.8
       LayoutHeader /var/www/www/banner.html
       DefaultType text/html
       AddType text/html .html .shtml .php .php3 .asp .jsp
       AddOutputFilterByType LAYOUT text/html
       SetOutputFilter LAYOUT
     </Proxy>
     ProxyRequests On
     AllowCONNECT 443
     NoProxy 192.168.8.2 193.136.92.156
     ProxyDomain .my.domain
     ProxyMaxForwards 10
     ProxyRemote * http://external.proxy:3128
   </VirtualHost>
</IfModule>

Can anyone see what is wrong or missing here?
Thank you.

----------------------------------------------------
António Rafael C. Paiva
Electronics and Telecommunications Dep.
Aveiro University