problem mit countdown timer code

ich habe einen Countdown timer der aber nach jedem aktuktulisieren von vorne anfängt. ich will das er aber weiter runter geht. Ich hoffe mir kann jemand helfen. Hier der Code:
[spoiler]
jQuery.fn.countdown = function(userOptions)
{
  // Default options
  var options = {
    stepTime: 60,
    // startTime and format MUST follow the same format.
    // also you cannot specify a format unordered (e.g. hh:ss:mm is wrong)
    format: "dd:hh:mm:ss",
    startTime: "01:12:32:55",
    digitImages: 6,
    digitWidth: 53,
    digitHeight: 77,
    timerEnd: function(){},
    image: "digits.png"
  };
  var digits = [], interval;

  // Draw digits in given container
  var createDigits = function(where)
  {
    var c = 0;
    // Iterate each startTime digit, if it is not a digit
    // we'll asume that it's a separator
    for (var i = 0; i < options.startTime.length; i++)
    {
      if (parseInt(options.startTime) >= 0)
      {
        elem = $('<div id="cnt_' + i + '" class="cntDigit" />').css({
          height: options.digitHeight * options.digitImages * 10,
          float: 'left', background: 'url(\'' + options.image + '\')',
          width: options.digitWidth});
        digits.push(elem);
        margin(c, -((parseInt(options.startTime) * options.digitHeight *
                              options.digitImages)));
        digits[c].__max = 9;
        // Add max digits, for example, first digit of minutes (mm) has
        // a max of 5. Conditional max is used when the left digit has reach
        // the max. For example second "hours" digit has a conditional max of 4
        switch (options.format) {
          case 'h':
            digits[c].__max = (c % 2 == 0) ? 2: 9;
            if (c % 2 == 0)
              digits[c].__condmax = 4;
            break;
          case 'd':
            digits[c].__max = 9;
            break;
          case 'm':
          case 's':
            digits[c].__max = (c % 2 == 0) ? 5: 9;
        }
        ++c;
      }
      else
        elem = $('<div class="pro_cntSeparator"/>').css({float: 'left'})
                .text(options.startTime);

      where.append(elem)
    }
  };
 
  // Set or get element margin
  var margin = function(elem, val)
  {
    if (val !== undefined)
      return digits[elem].css({'marginTop': val + 'px'});

    return parseInt(digits[elem].css('marginTop').replace('px', ''));
  };

  // Makes the movement. This is done by "digitImages" steps.
  var moveStep = function(elem)
  {
    digits[elem]._digitInitial = -(digits[elem].__max * options.digitHeight * options.digitImages);
    return function _move() {
      mtop = margin(elem) + options.digitHeight;
      if (mtop == options.digitHeight) {
        margin(elem, digits[elem]._digitInitial);
        if (elem > 0) moveStep(elem - 1)();
        else
        {
          clearInterval(interval);
          for (var i=0; i < digits.length; i++) margin(i, 0);
          options.timerEnd();
          return;
        }
        if ((elem > 0) && (digits[elem].__condmax !== undefined) &&
            (digits[elem - 1]._digitInitial == margin(elem - 1)))
          margin(elem, -(digits[elem].__condmax * options.digitHeight * options.digitImages));
        return;
      }

      margin(elem, mtop);
      if (margin(elem) / options.digitHeight % options.digitImages != 0)
        setTimeout(_move, options.stepTime);

      if (mtop == 0) digits[elem].__ismax = true;
    }
  };

  $.extend(options, userOptions);
  this.css({height: options.digitHeight, overflow: 'hidden'});
  createDigits(this);
  interval = setInterval(moveStep(digits.length - 1), 1000);
 
 
};
$(function(){$('#pro_counter').countdown({image: 'images/pro_images/digits.png',startTime: '98:02:00:00'});
[/spoiler]