get randomly reordered 1234 (or abcd) without using arrays

gistfile1.js

      var a = 'a', b = 'b', c = 'c', d = 'd';
      a = 'a';
      var r = RANDOM();
      if (r < .5) {
        b = a;
        a = 'b';
      }
      r = RANDOM();
      if (r < .33) {
        c = b;
        b = a;
        a = 'c';
      } else if (c < .66) {
        c = b;
        b = 'c';
      }
      r = RANDOM();
      if (r < .25) {
        d = c;
        c = b;
        b = a;
        a = 'd';
      } else if (c < .5) {
        d = c;
        c = b;
        b = 'd';
      } else if (c < .75) {
        d = c;
        c = 'd';
      }

      return a+b+c+d;