Change error page by file type?

[Roxis]

On Thursday 15 May 2008, Rt Ibmer wrote:
> If someone makes a request for a .js file from our server and no such file
> exists, I would like to return a different error page (actually an error.js
> page) in response.  Yet if they request a .htm page I want to use a
> different error page (notfound.htm).  Is this possible? If so can you
> please show an example configuration file snippet to do this? Thank you!

location ~ \.js$ {
    error_page 404 /errors/error.js;
}

location ~ \.htm$ {
    error_page 404 /errors/notfound.htm;
}

location /errors/ {
#nothing here
}