[javascript] Format seconds as a time string

gistfile1.js

function formatSecondsAsTime(secs, format) {
  var hr  = Math.floor(secs / 3600);
  var min = Math.floor((secs - (hr * 3600))/60);
  var sec = Math.floor(secs - (hr * 3600) -  (min * 60));

  if (hr < 10)  { hr    = "0" + hr; }
  if (min < 10) { min = "0" + min; }
  if (sec < 10) { sec  = "0" + sec; }
  if (hr)       { hr   = "00"; }

  if (format != null) {
    var formatted_time = format.replace('hh', hr);
    formatted_time = formatted_time.replace('h', hr*1+""); // check for single hour formatting
    formatted_time = formatted_time.replace('mm', min);
    formatted_time = formatted_time.replace('m', min*1+""); // check for single minute formatting
    formatted_time = formatted_time.replace('ss', sec);
    formatted_time = formatted_time.replace('s', sec*1+""); // check for single second formatting
    return formatted_time;
  } else {
    return hr + ':' + min + ':' + sec;
  }
}