Basically the counter I have created for a website seems to be working as I want it to (I can edit it to do what I want) - but for some reason when I increment it by decimals i.e. 0.1, 0.2, 0.3 etc the formatting glitches?

You can view the counter live at http://lowco2.eu

Here is the code behind the counter:

Script:

  > <script type="text/javascript">

      var number = <?=(int)((time()-1262325600)/150);?>; // put your initial value here

    function incrementNumber () {
        number += 0.1; // you can increment by anything you like here
      document.getElementById('total').innerHTML = number;
    }

    // this will run incrementNumber() every second (interval is in ms)
    setInterval(incrementNumber, 1000);

      function formatNumber(num) {
       num = String(num);

       if (num.length <= 3) {
          return num;
       } else {
          var last3nums = num.substring(num.length - 3, num.length);
          var remindingPart = num.substring(0, num.length - 3);
          return formatNumber(remindingPart) + ',' + last3nums;
       }
    }

    </script>

Any help is much appreciated!