Animate numbers jQuery

gistfile1.js

//http://stackoverflow.com/questions/149055/how-can-i-format-numbers-as-money-in-javascript
Number.prototype.formatMoney = function(c, d, t){
    var n = this, c = isNaN(c = Math.abs(c)) ? 2 : c, d = d == undefined ? "," : d, t = t == undefined ? "." : t, s = n < 0 ? "-" : "", i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;
    return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
};

function animateNumberChange(el,number,callback, interval, relax_interval)
{
    var currentVal = el.data("value");
    var endVal = number;

    if(!callback) { callback = null; }
    if(!interval) { interval = 2000; }
    if(!relax_interval) { relax_interval = 5000; }

    el.data("value",endVal);

    if (currentVal === endVal){
        return !callback ? null : setTimeout(callback,relax_interval);
    }

    var handle = setInterval(function ()
    {
        if (currentVal === endVal)
        {
            clearInterval(handle);
            !callback ? null : setTimeout(callback,interval);
        }
        else
        {
            if(currentVal < endVal){
                currentVal++;
            } else {
                currentVal--;
            }
            el.text(currentVal.formatMoney(0, '.', ','));
        }
    }, 1);
}

//HOW TO USE IT?
//http://jsfiddle.net/peghc/