well easiest way is to copy the javascript in that example and put it into its own .js file.
call mootools library script from your html <script src="http://ajax.googleapis.com/ajax/libs/mootools/1.2.4/mootools-yui-compressed.js"></script>
then call your plugin file <script src="https://stackoverflow.com/questions/12587603/js/plugin.js"></script>
then include your initialization script (from that example, it looks like it goes at the bottom of the page, but im not sure)
<script type="text/javascript" charset="utf-8">
//<![CDATA[
window.addEvent('domready', function(){
var total = $('total'); // this is the id of the element that will display the number
var totalFx = new Fx.CashRegister(total, {duration: 2000});
totalFx.start(124353526.99); // this is the number that you want to show first when page loads
});
</script>
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solved Building my own script for gasoline pump effect