number_format.js

function number_format(number, decimals, dec_point, thousands_sep) {
    var number = (number + '').replace(/[^0-9+\-Ee.]/g, '');
    var n = !isFinite(+number) ? 0 : +number,
        prec = !isFinite(+decimals) ? 0 : Math.abs(decimals),
        sep = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep,
        dec = (typeof dec_point === 'undefined') ? '.' : dec_point,
        s = '',
        toFixedFix = function (n, prec) {
            var k = Math.pow(10, prec);
            return '' + (Math.round(n * k) / k).toFixed(prec);
        }

    // Fix for IE parseFloat(0.55).toFixed(0) = 0;
    var s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.');

    if(s[0].length > 3) s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep);
    if( (s[1] || '').length < prec ) {
        s[1] = s[1] || '';
        s[1] += new Array(prec - s[1].length + 1).join('0');
    }

    return s.join(dec);
}