[racket] Quick on-screen documentation

Using vanilla Dr Racket, I don't have a Script menu item until I
install your plugin. But then I can't access the menu at all...

Also, installing the plugin gives these errors:

filebox: self-contract violation, received 1 argument, expected 2
non-keyword arguments
  contract from:
    <collects>/scribble/private/manual-style.rkt
  blaming:
    <collects>/scribble/private/manual-style.rkt
  contract:
    (-> (or/c element? string?) pre-flow? block?)
  at: <collects>/scribble/private/manual-style.rkt:25.19
raco setup: error: during Building docs for
/Users/antirealist/Library/Racket/planet/300/5.2.1/cache/orseau/script-plugin.plt/2/7/scribblings/manual/manual.scrbl
raco setup:   filebox: self-contract violation, received 1 argument,
expected 2 non-keyword arguments
  contract from:
    <collects>/scribble/private/manual-style.rkt
  blaming:
    <collects>/scribble/private/manual-style.rkt
  contract:
    (-> (or/c element? string?) pre-flow? block?)
  at: <collects>/scribble/private/manual-style.rkt:25.19

Steve