How do I add html content and an ifile in the same maintenance page irule?

try this kind of irule:

when HTTP_REQUEST {
    switch [HTTP::path] {
        "/maintenance/logo.png" {
            HTTP::respond 200 content [ifile get "logo.png"] "Content-Type" "image/png"
            return
        }
        "/maintenance/maintenance.html" {
            HTTP::respond 200 content [ifile get "maintenance.html"] "Content-Type" "text/html"
            return
        }
        default {
            set dpool [LB::server pool]
            if { [active_members $dpool] == 0 } { HTTP::redirect "/maintenance/maintenance.html"; unset dpool; return}
            unset dpool
        }
    }
}