InteliScrollDown

" Barry Arthur
" 2011 06 22

func! InteliScrollDown()
  let fwl = line('w0')
  let lwl = line('w$')
  let lbl = line('$')
  if (lbl - lwl) >= (lwl - fwl)
    return "\<c-f>"
  else
    return "\<c-d>"
  endif
endfunc

nnoremap <expr> <PageDown> InteliScrollDown()