in place array shuffling with fisher-yates

gistfile1.js

Array.prototype.shuffle = function() {
  var l = this.length, t, r;
  if (l == 0) return;
  
  while (l--) {
    r = Math.floor(Math.random() * l + 1);
    t = this[l];
    this[l] = this[r]
    this[r] = t;
  }
}

prototyped implementation of http://www.wrwrwr.org/2008/january/javascript-shuffle