Making an effect of number changing

I have a counter set like this:

<ul>
    <li id="cenMill">0</li>
    <li id="decMill">0</li>
    <li id="uniMill">0</li>
    <li id="cen">3</li>
    <li id="dec">2</li>
    <li id="uni">1</li>
</ul>

0 0 0 3 2 1

My intention is to have each number change according to a variable I give it, that is if I add +1 then just change id="uni" from 1 to 2 but if I gave it 12 then change both that are affected and so on. However I don't know how to start to do this so far this is what I have:

$('#uni').animate({
    marginTop: "-25px",
},200);

But this only places the 1 to the top, it doesn't make a "2" pop from underneath as the next number and the开发者_开发技巧 1 is visible and I can't hide it even with display, "none" or others like it. Any help (or ideas) as to how to do this?

This might be similar to what you are trying to achieve: Number ticker demo.

It's a hasty copy-paste from: http://damienhowley.wordpress.com/2009/06/29/jquery-number-ticker/

Even if you can't use it as is, it should give you some pointers on how to create your own. Good luck.