rock paper scissors javascript - code golf - small as possible

rock-paper-scissors.js

  var moves = ['rock','paper','scissors'],
      results = ['we draw','you loose','you win'],
      user_move = moves.indexOf(prompt(moves+'?')),
      computer_move,
      result;

  while (user_move > -1) {

    computer_move = Math.round(Math.random()*2);
    result = results[ (2*user_move+computer_move)%3 ];
    alert( 'You choose: ' +moves[user_move]+ '\nI chose:' +moves[computer_move]+ '\n' +result);

    user_move = moves.indexOf(prompt(moves+'?',moves[user_move]));
  }

or even smaller in ruby!

moves = %w[rock paper scissors]
puts moves.join(' ')+'?'
yourMove = moves.index(gets.chomp).to_f
myMove = rand(3)
puts moves[myMove]
puts %w[draw lose win][(2*yourMove+myMove)%3]