$(document).ready(function(){
  if ($("#edit_minutes_remaining").length &&
      $("#edit_seconds_remaining").length) {
    var min = parseInt($("#edit_minutes_remaining").html());
    var sec = parseInt($("#edit_seconds_remaining").html());
    var sec_remain = min * 60 + sec;
    var start_time = new Date();
    var start_ms  = start_time.getTime();
    edit_remain_countdown(start_ms, sec_remain);
  }
});

function edit_remain_countdown(start_ms, sec_remain) {
  var now = new Date();
  var sec_diff = (now.getTime() - start_ms) / 1000;
  var new_sec = sec_remain - sec_diff;
  if (new_sec > 1) {
    $("#edit_minutes_remaining").html(Math.floor(new_sec/60) + '');
    $("#edit_seconds_remaining").html((Math.floor(new_sec) % 60) + '');
    setTimeout("edit_remain_countdown(" + start_ms + "," + sec_remain + ")", 1000);
  } else {
    $("#quiz_editable").hide();
  }
}