[TxMt] setting paths in TextMate

[Piero D'Ancona]

I installed ruby 1.8.5 and appscript on my mac
(and it is hugely better that the schizolanguage 
of AppleScript).

Now if I define a command in TextMate like

#!/usr/bin/env ruby
require "appscript"
include Appscript
te = app('TextEdit')

TextMate complains it (he) cannot find
appscript.rb (no use to give the explicit
path since then TextMate cannot find the
files require'd inside appscript, etc etc).

Clearly, I must set new paths,
but how? and maybe I should also tell
TextMate to use 1.8.5 instead of 1.8.2
I'm sure this is easy but have no idea
how to do it. Any help?

Thanks a lot,
Piero