title: Use custom 404 page for specific subdirectory only
body: <p>I have Wordpress installed in the root of my server. I have a separate mobile version of the site in a subdirectory (No CMS just straight PHP which serves up content from the database).</p>
  
  <p>When I encounter a 404 error in my subdirectory, the Wordpress 404 page comes up and I want it to use the custom one in the mobile directory.</p>
  
  <p>Is there a way to do this easily. .htaccess manipulation possibly? It's currently got the standard Wordpress stuff at the moment.</p>
  
  <p>Any thoughts would be appreciated.</p>