LayoutHeaderOff ignored?

<virtualhost www.foo.com:80>
# (I have some image/jpg spewing .cgi that I need to exclude)
LayoutDefaultHandlers Off
LayoutHandler text/html
LayoutHeader    /header.html

# exclude this path 
<Directory /home/user/public_html/somedir/>
LayoutHeaderOfff
</Directory>
</VirtualHost>

but http://www.foo.com/~user/somedir/index.html
continues to show the header. Do I have the ordering wrong? 

Also, it seems to override SSI from working (via Option Includes)

the <!--#include virtual="foo.html"-->

shows up in the browser, rather than it being parsed..

thanks,

- liem

(Hi Brian, LTNS)