ordinare array bidimensionali

[br1]

  var arr = [[1,1],[0,3],[0,2],[1,2],[0,1]];
  document.write(arr.sort(pippo));
  function pippo(a,b){ return (a[0]>b[0])?1:(a[0]<b[0])?-1:(a[1]>b[1])?1:-1; }