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Here you go, another JavaScript approach, originally posted on SO:

function getRepString (rep) {
  rep = rep+''; // coerce to string
  if (rep < 1000) {
    return rep; // return the same number
  } else if (rep < 10000) { // place a comma between
    return rep.charAt(0) + ',' + rep.substring(1);
  } else { // divide and format
    return (rep/1000).toFixed(rep % 1000 != 0)+'k';
  }
}

Check the output results here.